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CBSE Questions for Class 11 Medical Chemistry Organic Chemistry Some Basic Principles And Techniques Quiz 1 - MCQExams.com
CBSE
Class 11 Medical Chemistry
Organic Chemistry Some Basic Principles And Techniques
Quiz 1
What is the prefix if the number of carbon atoms is $$3$$?
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Eth-
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Prop-
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But-
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Pent-
Number of $$\pi$$-bods in the following compound $$\dfrac{CH_3C \equiv CN}{3}$$
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1
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2
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3
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none
Correctly match is :
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$$d_{x^2-y^2}$$ atomic orbital -- One nodal plane
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$$P_y$$ atomic orbital -- Two nodal planes
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$$\sigma_{P_x}$$ -- $$\psi$$ (gerade)
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$$P_{p_y}$$ -- $$\psi$$ (ungerade)
Explanation
$$\sigma$$-bonding molecular orbital is gerade due to having center of symmetry.
Prefix used for $$-COOH$$ functional group is :
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Carbomayl
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Carbonyl
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Carboxy
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Alkoxycarbonyl
Explanation
Carboxy prefix is used for $$-COOH$$ group, as it has one carbonyl and one hydroxy group.
Above Gauche form is stable when Z is:
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$$-C{ H }_{ 3 }$$
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$$-Et$$
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$$-Ph$$
$$IUPAC$$ name of $$[VO(O_{2})(acac)_{2}]$$ is
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bis(acetylacetonato)oxoperoxonanadium(VI)
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bis(acetylacetonato)oxoperoxonanadium(V)
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bis(acetylacetonato)oxoperoxonanadium(VIII)
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bis(acetylacetonato)oxoperoxonanadium(IV)
Urea was first organic compounds to be synthesised by:
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laminar
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wohlar
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beryine
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haber
Explanation
In 1928, the German chemist Friedrich Wohler obtained Urea artificially by treating silver cyanate with ammonium chloride.
Hence, option B is correct.
The functional groups which is not present in the given compound is:
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Amide
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Aldehyde
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Amine
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Ketone
Which functional group is present in a molecule of $${CH}_{3}O{CH}_{2}{CH}_{3}$$?
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Ether
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Carboxyl
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Ketone
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Aldehyde
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Ester
Explanation
The functional group present in $$\displaystyle {CH}_{3}-O-{CH}_{2}{CH}_{3}$$ is an ether group $$\displaystyle -O-$$.
Note: In general, ethers can be represented as $$\displaystyle R-O-R'$$
Select the option having incorrect named compound(s) :
(I)
3, 3-dimethyl-1-hydroxycyclohexane
(II)
4-ethoxy-2-methoxypentan-3-one
(III)
2-ethyl-1, 1-dimethylcyclopentane
(IV)
4-amino-2-hydroxy-4-oxobutanal
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I, II and III
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III only
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II and IV
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II only
Which of the following alkenes have more value of heat of hydrogenation than _____________.
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During the estimation of C and H, the $$CO_{2}$$ produced is absorbed in
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$$KOH$$
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$$Anhydrous\ CaCl_2$$
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$$CuO$$
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$$O_2$$
How may $$\pi$$-bonds in following molecules:
a) $$C_{2}H_{6}$$ b) $$C_{2}H_{4}$$ c) $$C_{2}H_{2}$$
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$$0$$,$$2$$,$$1$$
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$$0$$,$$1$$,$$2$$
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$$2$$,$$0$$,$$1$$
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$$1$$,$$1$$,$$1$$
The number of $$\pi $$ electrons in butadiene is
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2
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4
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6
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8
The ratio of $$\sigma $$-bond and $$\pi $$-bond in tetracyano ethylene is:
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2:1
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1:1
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1:2
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none of these
IUPAC name of above compound is :
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Dimethylamine
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2-amino propane
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Isopropylamine
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2-propanamine
Explanation
In the given compound the functional group is the amine group($$-NH_{2}$$).There are 3 carbon atoms present in the backbone. So according to I.U.P.A.C the name of the compound will be 2-propanamine. So the correct option is D
Ethanoic acid is also known as :
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citric acid.
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nitric acid.
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acetic acid.
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formic acid.
Explanation
Ethanoic acid is also knwon as Acetic acid and Methanecarboxylic acid.
The correct IUPAC name of the alkyl group,
$$ { CH }_{ 3 }-\overset { \overset { { C }_{ 2 }H_{ 5 } }{ | } }{ CH } -{ CH }_{ 2 }-{ \overset { \overset { { C }_{ 2 }{ H }_{ 5 } }{ | } }{ CH-C } H }_{ 3}$$
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2-ethyl-3-sec-butyl propyl
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2,4-diethyl pentane
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2-ethyl-4-methylhexyl
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2-methyl-4-ethylexyl
Explanation
The correct IUPAC name of the given compound is 2,4-diethylpentane.
Hence, option B is correct.
$$IUPAC$$ name of is
$$CH_3 - \underset{O}{\underset{||}{C}} - CH_2 - C = N$$
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$$1-$$Cyanpropan$$-2-$$ one
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$$3-$$Cyanpropan$$-2-$$one
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$$3-$$Oxobutanitrile
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$$2-$$Opropanenitrie
IUPAC name of the compound
$$BrCH_2-CHCl-CHCl_2$$ is
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$$1-Bromo-2, 3 , 3-trichloropropane$$
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$$1 , 1 , 2-Trichloro-3-bromopropane$$
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$$3-Bromo-1, 1 , 2-trichloropropane$$
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$$Trichlorobromopropane$$
IUPAC Name of some compounds are given. Which one is incorrect?
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Explanation
According to IUPAC name of substituents are written according to alphabetical order.
So the name of the compound is written as $$4-ethyl-3-methylheptane$$
How many $$\sigma$$ & $$\pi$$ bonds are present in
$$C_{2}H_{4}$$
molecule?
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$$5\sigma$$, $$1\pi$$
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$$1\sigma$$, $$5\pi$$
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$$6\sigma$$, $$1\pi$$
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$$8\sigma$$, $$1\pi$$
The IUPAC name of the compound is:
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2 - Ethyl - 1 , 1 - dimethylcyclopentane
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1 - Ethyl - 2 , 2 - dimethylcyclopentane
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1 , 1 - Dimethyl - 2 - ethylcyclopentane
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2 , 2 - Dimethyl - 1 - ethylcyclopentane
Which of the following is extracted from the roots of the valerian plant?
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$$CH_{3} -(CH_{2})_{3} - COOH$$
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$$CH_{3} - CH_{2} - COOH$$
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$$CH_{3} -(CH_{2})_{2} - COOH$$
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$$CH_{3} -(CH_{2})_{4} - COOH$$
Explanation
Valeric acid is derived from the roots of Valerian Plant.
Valeric acid is $$CH_{3}-CH_{2}-CH_{2}-CH_{2}-COOH$$.
Which of the following diamagnetic species having only $$\pi$$ bond in the vapor phase?
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$$O_2$$
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$$O_2^{2-}$$
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$$B_2$$
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$$C_2$$
The cyclic polymerization of methyl acetylene gives mesitylene. The number of sigma bonds in mesitylene is:
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16
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12
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18
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21
Total number of $$\sigma$$ & $$\pi$$ bonds in a molecule
$$C_{2}H_{2}$$ are
respectively
:
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3, 2
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4, 2
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3, 1
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2, 1
Which is / are the correct IUPAC name of the corresponding structures?
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Explanation
1)Correct
2)Correct
3)Correct
4)Incorrect because the cyclohexane must not be taken here as parent chain, it should be considered as a alkyl group attached to parent chain of 1 carbon.
Correct name will be 1-Cyclohexylmethanal
Carboxylic group is present in:
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ethylene
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methanoic acid
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formaldehyde
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ethanol
Explanation
When a carbon compound is attached to the functional group $$-COOH$$ (carboxyl group) then the compound refers to as carboxylic acids. From above structure formula of methanoic acid is $$HCOOH$$,hence it contain carboxylic acid group.
Total number of functional groups present in the given compound is:
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7
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10
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8
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9
Nodal planes of $$\pi -bond(s)$$ in $$C{ H }_{ 2 }=C=C=C{ H }_{ 2 }$$ are located in:
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All are in molecular planar
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Two in the molecular plane and one in a plane perpendicular to the molecular plane which contains $$C-C\ \sigma -bond$$
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One in the molecular plane and two in-plane perpendicular to the molecular plane which contains $$C-C\ \sigma -bond$$
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Two in the molecular plane and one in a plane perpendicular to the molecular plane which bisects $$C-C\ \sigma -bond$$ at the right angle
What is qualitative analysis?
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Identification of unknown substance by direct observation
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Identification of unknown substance by chemical tests.
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Both A & B
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None of the above
Explanation
Qualitative analysis includes identification of unknown substance by chemical tests.
identification of substances by their physical and chemical properties.
The correct IUPAC name of the compound is
:
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5,6-Diethyl-3-methyl dec-4-ene
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5,6-Diethyl-8-methyl dec-6-ene
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6-Butyl-S-ethyl-3-methyl oct-4-ene
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none of these
Explanation
The correct IUPAC name of the compound is
2,6-Dimethyl-3-methylhydroxyhept-1,5-diene
Which of the following species contains equal number of $$\sigma$$ and $$\pi$$ bonds ?
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$$(CN)_2$$
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$$CH_2(CN)_2$$
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$$HCO_3^-$$
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$$XeO_4$$
Explanation
The number of $$\sigma$$ and $$\pi$$ bonds is given below.
Molecule
Number of $$\sigma$$ bonds
Number $$\pi$$ of bonds
$$(CN)_2$$
3
4
$$CH_2(CN)_2$$
6
4
$$HCO_3^-$$
4
1
$$XeO_4$$
4
4
Thus, $$XeO_4$$ contains equal number of and bonds.
The total number of $$\pi $$ electrons in the given structure are :
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12
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16
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4
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8
Explanation
The given compound is tetraene. In other words, it contains 4 C=C double bonds.
Each bond contains 2 electrons.
Hence, the number of bond electrons is $$4 \times 2 = 8$$.
Therefore, the correct option is D.
The functional group present in organic acid is:
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$$-OH$$
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$$-CHO$$
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$$-COOH$$
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$$> C = O$$
Explanation
The functional group present every organic acid is $$-COOH$$ as it dissociate in water as $$-COO^-$$ and $$H^+$$.
The main source of organic compounds is :
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coaltar
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petroleum
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both (a) and (b)
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none of the above
Explanation
Petroleum and coaltar are the main sources of organic compounds.
How many pi bonds are present in phosgene?
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1
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2
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3
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4
Explanation
From the image we can see that there is only 1 pi-bond present in phosgene (cabonyl chrolide).
Marsh gas is:
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$$C_6H_6$$
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$$CH_4$$
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$$C_2H_2$$
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$$CO$$
Explanation
Marsh gas is methane, $$CH_4$$. It is called so because it is often obtained from marshy places.
Correct IUPAC name for the given compound is:
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1-Ethoxy-1-aminobutane
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1-Amino-1-ethoxy-1-methylpropane
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1-Ethoxy-2-propanol
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2-Ethoxybutan-2-amine
Explanation
The functional group on first priority in the given compound is an amine .
So we will number the parent chain so as to give amine the lowest number.
Thus the carbon-containing amine will be numbered (2).
So , the correct IUPAC name is 2-Ethoxybutan-2-amine .
Choose the correct options.
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Name of the compound : is (1, 1-dimethylethyl) cyclononane
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The IUPAC name of the compound :
$$CH_3-CH=CH_2-C\equiv C-CH_2-CH_3$$ is oct-2-en-5-yne.
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Ethanol is insoluble in water
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Ethanol, when heated with $$Conc. H_2SO_4$$ at 443 K undergoes dehydration.
Explanation
(A) The molecule has a tery-butyl group bounded to a nine-membered cycloalkane. It is tert-butylcyclononane. Alternatively, the tert-butyl group could be named systematically as a 1,1-dimethylethyl group, and the compound would then be named.
(1, 1-dimethylethyl) cyclononane. (Parentheses are used when necessary to avoid ambiguity. In this case, the parentheses alert the reader that the locants 1, 1 refers to substituents on the alkyl group and not to ring positions.)
(B) The longest chain contains 7 carbons. So this is wrong statement.
(C) Ethanol is soluble in water
(D) Ethanol, when heated with Conc. $$H_2SO_4$$ at 443K undergoes dehydration.
Hence, the correct options are $$\text{A}$$ and $$\text{D}$$
The fruity smell is of a/an:
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aldehyde
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ketone
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alcohol
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ester
Explanation
Esters
have a fruity smell due to their volatile nature caused by their chemical composition and conformations.
Linear combination of two hybridised orbitals belonging to two atoms and each having one electron leads to the formation of:
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sigma bond
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double bond
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co-ordinate covalent bond
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pi bond
Explanation
A sigma bond is a single bond formed by linear combination of hybridised orbitals.
The colour of bromine solution is :
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Red
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Purple
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Orange
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Green
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Blue
Explanation
Bromine
is a chemical element
with symbol
Br
and atomic number
35. It is the third-lightest halogen
, and is a fuming red-brown liquid
at room temperature that evaporates readily to form a similarly coloured gas.
IUPAC name of $${CH}_{3}O{C}_{2}{H}_{5}$$ is:
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ethoxy methane
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methoxy ethane
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both (A) and (B)
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none of these
Explanation
According to IUPAC nomenclature system, ethers are known as alkoxy alkane. The ether oxygen is taken with a smaller alkyl group and creates the alkoxy group while larger alkyl group is considered as a alkyl group. So the name will be methoxy ethane. Hence option B is correct.
The IUPAC name of the compound, is?
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2-methyl spiro [4.5] dec-1-ene
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2-methyl spiro [5.4] dec-1-ene
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2-methyl spiro [4.5] dec-2-ene
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2-methyl spiro [5.4] dec-2-ene
Indicate the wrongly named compound.
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Explanation
Answer:-
Since the numbering of parent chain starts from the side where the main functional group is attached, the correct name of the compound is :
Hex-3-ene-2-one.
'I.U.P.A.C.', stands for?
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Iodine Under Packing
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International Union of Pure and Applied Chemistry
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International Units of Protein and Carbohydrates
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International Understanding on Physical Aspects of Chemistry
Explanation
Solution:- (B) International Union of Pure and applied Chemistry.
Explanation:-
A chemical nomenclature is a set of rules to generate systematic names for chemical compounds. The nomenclature used most frequently worldwide is the one created and developed by the International Union of Pure and Applied Chemistry. The full form of IUPAC is International Union for Pure and Applied Chemistry.
What is the correct $$IUPAC$$ name of the following compound?
$$CH_{2}=CH-CH_{2}-C \equiv CH$$
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Pent-$$1$$-en-$$4$$-yne
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Pent-$$4$$-yn-$$1$$-ene
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Pent-$$4$$-en-$$1$$-yne
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Pent-$$1$$-yn-$$4$$-ene
Explanation
In the given compound,
a. The carbon backbone chain contains total 5 carbon atoms so the root word will be "pent".
b. There are both double and triple bond present in the molecule, hence double bond will get the priority over the triple bond and backbone numbering will be done in such a way that the double bond will be assigned the minimum number.
c. "ene" comes before "yne" in the name
So the I.U.P.A.C name of the compound will be Pent-1-en-4-yne. So the correct option is A
IUPAC name of the compound
$$CH_3 - (CH_2)_4 - CH - \underset{C_2H_5(CH_2)_2 - CH_3}{\underset{|}{\overset{CH_3}{\overset{|}{C}}}} - CH_3$$ is?
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$$5-$$ ethyl $$-4$$, $$4-$$dimethyl decane
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$$4-$$ ethyl $$4$$, $$5$$dimethyl decane
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$$3, 4-$$ dimethyl $$-3 -$$ Hexane
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$$6, 7-$$ dimethyl decane
Explanation
$$CH_3$$
$$^{10}{CH_3}-^{9}{CH_2}-^8CH_2-^7CH_2-^6CH_2-^5\underset {|}{CH}-^4\overset {|}{\underset {|}C}-CH_3$$
$$C_2H_5$$ $$3CH_2-^2CH_2-^1CH_3$$
Numbering should be started from right side. $$2$$ methyl and one ethyl groups are attached $$C_4$$ and $$C_5$$ respectively. So the IUPAC name of this compound is $$5-ethyl-4,4-dimethyl decane$$ .
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