$$\sigma_{P_x}$$ -- $$\psi$$ (gerade)

$$d_{x^2-y^2}$$ atomic orbital -- One nodal plane

$$P_y$$ atomic orbital -- Two nodal planes

$$P_{p_y}$$ -- $$\psi$$ (ungerade)

MCQ Questions for Class 11 Medical Chemistry Organic Chemistry Some Basic Principles And Techniques Quiz 1

What is the prefix if the number of carbon atoms is

$3$ ?

0%
Eth-
0%
Prop-
0%
But-
0%
Pent-

Number of

$\pi$ -bods in the following compound

$\dfrac{CH_3C \equiv CN}{3}$

0%
1
0%
2
0%
3
0%
none

Correctly match is :

0%
$d_{x^2-y^2}$ atomic orbital -- One nodal plane
0%
$P_y$ atomic orbital -- Two nodal planes
0%
$\sigma_{P_x}$ -- $\psi$ (gerade)
0%
$P_{p_y}$ -- $\psi$ (ungerade)

Explanation

$\sigma$ -bonding molecular orbital is gerade due to having center of symmetry.

Prefix used for

$-COOH$ functional group is :

0%
Carbomayl
0%
Carbonyl
0%
Carboxy
0%
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:

0%
$-C{ H }_{ 3 }$
0%
$-Et$
0%
0%
$-Ph$

$IUPAC$ name of

$[VO(O_{2})(acac)_{2}]$ is

0%
bis(acetylacetonato)oxoperoxonanadium(VI)
0%
bis(acetylacetonato)oxoperoxonanadium(V)
0%
bis(acetylacetonato)oxoperoxonanadium(VIII)
0%
bis(acetylacetonato)oxoperoxonanadium(IV)

Urea was first organic compounds to be synthesised by:

0%
laminar
0%
wohlar
0%
beryine
0%
haber

The functional groups which is not present in the given compound is:

0%
Amide
0%
Aldehyde
0%
Amine
0%
Ketone

Which functional group is present in a molecule of

${CH}_{3}O{CH}_{2}{CH}_{3}$ ?

0%
Ether
0%
Carboxyl
0%
Ketone
0%
Aldehyde
0%
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

0%
I, II and III
0%
III only
0%
II and IV
0%
II only

Which of the following alkenes have more value of heat of hydrogenation than _____________.

During the estimation of C and H, the

$CO_{2}$ produced is absorbed in

0%
$KOH$
0%
$Anhydrous\ CaCl_2$
0%
$CuO$
0%
$O_2$

How may

$\pi$ -bonds in following molecules:
a)

$C_{2}H_{6}$ b)

$C_{2}H_{4}$ c)

$C_{2}H_{2}$

0%
$0$ , $2$ , $1$
0%
$0$ , $1$ , $2$
0%
$2$ , $0$ , $1$
0%
$1$ , $1$ , $1$

The number of

$\pi$ electrons in butadiene is

0%
2
0%
4
0%
6
0%
8

The ratio of

$\sigma$ -bond and

$\pi$ -bond in tetracyano ethylene is:

0%
2:1
0%
1:1
0%
1:2
0%
none of these

IUPAC name of above compound is :

0%
Dimethylamine
0%
2-amino propane
0%
Isopropylamine
0%
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 :

0%
citric acid.
0%
nitric acid.
0%
acetic acid.
0%
formic acid.

The correct IUPAC name of the alkyl group,

${ CH }_{ 3 }-\overset { \overset { { C }_{ 2 }H_{ 5 } }{ | } }{ CH } -{ CH }_{ 2 }-{ \overset { \overset { { C }_{ 2 }{ H }_{ 5 } }{ | } }{ CH-C } H }_{ 3}$

0%
2-ethyl-3-sec-butyl propyl
0%
2,4-diethyl pentane
0%
2-ethyl-4-methylhexyl
0%
2-methyl-4-ethylexyl

$IUPAC$ name of is

$CH_3 - \underset{O}{\underset{||}{C}} - CH_2 - C = N$

0%
$1-$ Cyanpropan $-2-$ one
0%
$3-$ Cyanpropan $-2-$ one
0%
$3-$ Oxobutanitrile
0%
$2-$ Opropanenitrie

IUPAC name of the compound

$BrCH_2-CHCl-CHCl_2$ is

0%
$1-Bromo-2, 3 , 3-trichloropropane$
0%
$1 , 1 , 2-Trichloro-3-bromopropane$
0%
$3-Bromo-1, 1 , 2-trichloropropane$
0%
$Trichlorobromopropane$

IUPAC Name of some compounds are given. Which one is incorrect?

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?

0%
$5\sigma$ , $1\pi$
0%
$1\sigma$ , $5\pi$
0%
$6\sigma$ , $1\pi$
0%
$8\sigma$ , $1\pi$

The IUPAC name of the compound is:

0%
2 - Ethyl - 1 , 1 - dimethylcyclopentane
0%
1 - Ethyl - 2 , 2 - dimethylcyclopentane
0%
1 , 1 - Dimethyl - 2 - ethylcyclopentane
0%
2 , 2 - Dimethyl - 1 - ethylcyclopentane

Which of the following is extracted from the roots of the valerian plant?

0%
$CH_{3} -(CH_{2})_{3} - COOH$
0%
$CH_{3} - CH_{2} - COOH$
0%
$CH_{3} -(CH_{2})_{2} - COOH$
0%
$CH_{3} -(CH_{2})_{4} - COOH$

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?

0%
$O_2$
0%
$O_2^{2-}$
0%
$B_2$
0%
$C_2$

The cyclic polymerization of methyl acetylene gives mesitylene. The number of sigma bonds in mesitylene is:

0%
16
0%
12
0%
18
0%
21

Total number of

$\sigma$ &

$\pi$ bonds in a molecule

$C_{2}H_{2}$ are respectively :

0%
3, 2
0%
4, 2
0%
3, 1
0%
2, 1

Which is / are the correct IUPAC name of the corresponding structures?

Carboxylic group is present in:

0%
ethylene
0%
methanoic acid
0%
formaldehyde
0%
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:

0%
7
0%
10
0%
8
0%
9

Nodal planes of

$\pi -bond(s)$ in

$C{ H }_{ 2 }=C=C=C{ H }_{ 2 }$ are located in:

0%
All are in molecular planar
0%
Two in the molecular plane and one in a plane perpendicular to the molecular plane which contains $C-C\ \sigma -bond$
0%
One in the molecular plane and two in-plane perpendicular to the molecular plane which contains $C-C\ \sigma -bond$
0%
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?

0%
Identification of unknown substance by direct observation
0%
Identification of unknown substance by chemical tests.
0%
Both A & B
0%
None of the above

The correct IUPAC name of the compound is :

0%
5,6-Diethyl-3-methyl dec-4-ene
0%
5,6-Diethyl-8-methyl dec-6-ene
0%
6-Butyl-S-ethyl-3-methyl oct-4-ene
0%
none of these

Which of the following species contains equal number of

$\sigma$ and

$\pi$ bonds ?

0%
$(CN)_2$
0%
$CH_2(CN)_2$
0%
$HCO_3^-$
0%
$XeO_4$

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 :

0%
12
0%
16
0%
4
0%
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:

0%
$-OH$
0%
$-CHO$
0%
$-COOH$
0%
$> C = O$

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 :

0%
coaltar
0%
petroleum
0%
both (a) and (b)
0%
none of the above

How many pi bonds are present in phosgene?

0%
1
0%
2
0%
3
0%
4

Marsh gas is:

0%
$C_6H_6$
0%
$CH_4$
0%
$C_2H_2$
0%
$CO$

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:

0%
1-Ethoxy-1-aminobutane
0%
1-Amino-1-ethoxy-1-methylpropane
0%
1-Ethoxy-2-propanol
0%
2-Ethoxybutan-2-amine

Choose the correct options.

0%
Name of the compound : is (1, 1-dimethylethyl) cyclononane
0%
The IUPAC name of the compound :

$CH_3-CH=CH_2-C\equiv C-CH_2-CH_3$ is oct-2-en-5-yne.
0%
Ethanol is insoluble in water
0%
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.

(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:

0%
aldehyde
0%
ketone
0%
alcohol
0%
ester

Linear combination of two hybridised orbitals belonging to two atoms and each having one electron leads to the formation of:

0%
sigma bond
0%
double bond
0%
co-ordinate covalent bond
0%
pi bond

The colour of bromine solution is :

0%
Red
0%
Purple
0%
Orange
0%
Green
0%
Blue

IUPAC name of

${CH}_{3}O{C}_{2}{H}_{5}$ is:

0%
ethoxy methane
0%
methoxy ethane
0%
both (A) and (B)
0%
none of these

The IUPAC name of the compound, is?

0%
2-methyl spiro [4.5] dec-1-ene
0%
2-methyl spiro [5.4] dec-1-ene
0%
2-methyl spiro [4.5] dec-2-ene
0%
2-methyl spiro [5.4] dec-2-ene

Indicate the wrongly named compound.

'I.U.P.A.C.', stands for?

0%
Iodine Under Packing
0%
International Union of Pure and Applied Chemistry
0%
International Units of Protein and Carbohydrates
0%
International Understanding on Physical Aspects of Chemistry

What is the correct

$IUPAC$ name of the following compound?

$CH_{2}=CH-CH_{2}-C \equiv CH$

0%
Pent- $1$ -en- $4$ -yne
0%
Pent- $4$ -yn- $1$ -ene
0%
Pent- $4$ -en- $1$ -yne
0%
Pent- $1$ -yn- $4$ -ene

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?

0%
$5-$ ethyl $-4$ , $4-$ dimethyl decane
0%
$4-$ ethyl $4$ , $5$ dimethyl decane
0%
$3, 4-$ dimethyl $-3 -$ Hexane
0%
$6, 7-$ 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

$5-ethyl-4,4-dimethyl decane$ .

CBSE Questions for Class 11 Medical Chemistry Organic Chemistry Some Basic Principles And Techniques Quiz 1 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

CBSE Questions for Class 11 Medical Chemistry Organic Chemistry Some Basic Principles And Techniques Quiz 1 - MCQExams.com

0:0:1

Practice Class 11 Medical Chemistry Quiz Questions and Answers

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