CBSE Questions for Class 11 Medical Chemistry Organic Chemistry Some Basic Principles And Techniques Quiz 10 - MCQExams.com


Which of the following has $$p_π​−d_π​$$ bonding?
  • $$NO_3^-$$
  • $$SO_3^{2-}$$
  • $$BO_3^{3-}$$
  • $$CO_3^{2-}$$
Number of bonds in $$SO_2$$:
  • Two $$\sigma$$ and two $$\pi$$
  • Two $$\sigma$$ and one $$\pi$$
  • Two $$\sigma$$ and two $$\pi$$ and one lone pair
  • None of these
The number of $$\pi$$ bonds in 3-hexyne-1-ene is 
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
Which of the following is not o, pdirecting group
  • $$-NH_{2}$$
  • $$-OH$$
  • $$-X (halogens)$$
  • $$-CHO$$
How many $$\pi$$ bonds are present in naphthalene molecule?
  • $$3$$
  • $$4$$
  • $$5$$
  • $$6$$
Which of the following is azo-group
  • $$ -N= $$
  • $$ -N=N- $$
  • $$ -NH- $$
  • $$ -CO-NH- $$
Ethylene possess
  • two sigma and two pi bonds
  • two pi bonds
  • five sigma and one pi bond
  • four sigma and one pi bond
Cresol has
  • Alcoholic OH
  • Phenolic OH
  • $$ -COOH $$
  • $$ -CHO $$
Number of $$\sigma$$ and $$\pi$$ bonds present in 1-buten-3-yne respectively are 
  • $$7\sigma, 3\pi$$
  • $$5\sigma, 2\pi$$
  • $$8\sigma, 3\pi$$
  • $$6\sigma, 2\pi$$
Which of the following do not contain an acyl group?
  • Acid chloride
  • Amide
  • Ester
  • Ether
A carbon-carbon triple bond in ethyne $$(-C\equiv C-)$$ consists of 
  • All $$\sigma$$ bonds
  • Two $$\sigma$$ bonds and one $$\pi-$$ bonds
  • One $$\sigma$$ bonds and two $$\pi-$$ bonds
  • All $$\pi$$ bonds
Which among the following is the strongest o, p-directing group
  • $$OH$$
  • $$Cl$$
  • $$C_{6}H_{5}$$
  • $$Br$$
Alchols may be represented by the general formula:
  • $$ C_{n}H_{2n+2}OH $$
  • $$ C_{n}H_{2n}OH $$
  •  $$ C_{n}H_{2n+1}OH $$
  • $$ C_{n}H_{2n-1}OH $$
Alkynes may be represented by the general formula:
  • $$ C_{n}H_{2n+2} $$
  • $$ C_{n}H_{2n-2} $$
  •  $$ C_{n}H_{2n+1} $$
  • $$ C_{n}H_{2n-1} $$
The decreasing order of priority for the following functional groups is:
I. $$-C\equiv N$$ II. $$-CONH_{2}$$ IV. $$-CHO$$
1768342_47abd9348659462298533ae90ebadbe5.png
  • $$(II) > (I) > (IV) > (III)$$
  • $$(III) > (IV) > (I) > (II)$$
  • $$(I) > (II) > (IV) > (III)$$
  • $$(I) > (II) > (III) > (IV)$$
Which of the following does not contain $$(-COOH)$$ group?
  • Asprin
  • Benzoic acid
  • Picric acid
  • All have $$(-COOH)$$ group
Glucose has functional group
  • Aldehydic
  • Aldehydic and alcoholic
  • Alcoholic
  • Ketonic and alcoholic
The decreasing order of priority for the following functional groups is:
I. $$-OH$$ II. $$-C\equiv C -$$ III. -OR IV. $$-NH_{2}$$.
  • $$(IV) > (I) > (II) > (III)$$
  • $$(IV) > (I) > (III) > (II)$$
  • $$(I) > (IV) > (III) > (II)$$
  • $$(II) > (III) > (IV) > (II)$$
In which of the following compounds, -OH is the functional group?
  • Butanone
  • Butanol
  • Butanoic acid
  • Butanal
Identify the correct sequence of increasing number of $$\pi$$-bonds in the structure of the following molecules :
(I) $$H_2S_2O_6$$   (II) $$H_2S_2O_3$$   (III) $$H_2S_2O_5$$
  • I, II and III
  • II, I and III
  • II, III and I
  • I, III and II
Which of the following molecule has weakest ($$p\pi - d\pi$$) back bonding ? 
  • $$ClO_2$$
  • $$N(SiH_3)_3$$
  • $$SiF_4$$
  • $$O(SiH_3)_2$$
The ratio of  $$\sigma$$ bond and $$\pi$$- bond in tetracyano ethylene is :
  • $$2:1$$
  • $$1:1$$
  • $$1:2$$
  • none of these
How many primary, secondary, tertiary and quaternary carbon atoms are present in the following compound?
  • One primary, two secondary and one tertiary
  • Five primary, three secondary
  • Five primary, one secondary, one tertiary and one quaternary
  • Four primary, two secondary and two quaternary
If the organic compound contains nitrogen and sulphur, sodium thiocyanate is always formed in the Lassaigne's test.
  • True
  • False
The decreasing order of priority for the following functional groups is:
I. $$-COOH$$ II. $$-SO_{3}H$$ III. $$-COOR$$ IV. $$-COCl$$
  • $$(IV) > (Ill) > (II) > (I)$$
  • $$(I) > (II) > (lll) > (IV)$$
  • $$(II) > (I) > (lll) > (IV)$$
  • $$(IV) > (Ill) > (I) > (II)$$
The IUPAC name of the compound is:
305207_9e10e9b62336414787e77493e4cb0d32.png
  • 5, 5, - diethyl - 4 - 4 - diethyl pentane
  • 3 - Ethyl - 4-4- dimethyl heptane
  • 1, 1, -Diethyl - 2, 2 - dimethyl pentane
  • 4, 4 - Dimethyl-5, 5 - diethyl pentane
The product of acid hydrolysis of P and Q can be distinguished by:

42969_fa995a9f0f704583ac6e141d6f28c204.png
  • Lucas Reagent
  • 2,4-DNP
  • Fehling's Solution
  • $$\mathrm{N}\mathrm{a}\mathrm{H}\mathrm{S}\mathrm{O}_3$$ 
In Lassaigne's method organic compound is fused with: 
  • sodium metal
  • zinc dust
  • sodium caronate and zinc dust
  • calcium metal
The compound (C) is:
The functional group present in the following compound is:
$$CH_{3}   CO   CH_{2}  CH_{2}   CH_{2}   CH_{3}$$
  • ketone
  • carboxylic acid
  • alcohol
  • carbonate
An organic compound $$X$$ give following laboratory tests.
(i) It gives white precipitate with tollen's reagent
(ii) it gives +ve iodoform test
(iii) It gives lucas test within 5 min
$$X$$ can be:
  • $$H-C\equiv C-(CH_2)_n - \underset{OH}{\underset{|}{C}H}-CH_2-CH_3$$
  • $$CH_3-C\equiv C - (CH_2)n-\underset{OH}{\underset{|}{C}H}-CH_3$$
  • $$H-C\equiv C-(CH_2)n-\underset{OH}{\underset{|}{C}H}-CH_3$$
  • none of the above
The nodal plane in the $$\pi$$ bond of ethene is located in:
  • the molecular plane.
  • a plane parallel to the molecular plane.
  • a plane perpendicular to the molecular plane, which bisects the carbon-carbon sigma bond at right angle.
  • a plane perpendicular to the molecular plane, which contains the carbon - carbon s-bond.
An organic compound $$X$$ having molecular mass $$60$$ is found to contain $$C=20\%, H=6.67\%$$ and $$N=46.67\%$$, while rest is oxygen. On heating it gives ammonia along with a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound $$X$$ is:
  • $$CH_3CH_2CONH_2$$
  • $$CH_3NCO$$
  • $$CH_3CONH_2$$
  • $$(NH_2)_2CO$$
The IUPAC name for tertiary butyl iodide is:
  • 4-iodobutane
  • 2-iodobutane
  • 1-iodo, 3-methyl propane
  • 2-Iodo-2-methyl propane
Why is functional group important?
  • Because it is the portion of the organic molecule capable of characteristic reactions
  • Because it is how compounds are named
  • Because it is how you classify molecules
  • Because it contains carbon on which all life is formed
  • Because it is the portion of the organic molecule that does not undergo any reaction
$$CH_3-C=CH-C-OCH_3$$   is named in IUPAC as:
             $$|$$                    $$||$$
            $$Cl$$                 $$O$$
  • methyl-3-chloro-2-butenoate
  • methy-4-chloro-2-pentanoate
  • methoxy-3-chlorobutanol
  • methoxy-2-chlorobutanone
Which is matched incorrectly?
  • Both (a) and (b)
  • None of the above
Which of the following group is sharp ortho and para directive?
  • $$-C_6H_5$$
  • $$-OH$$
  • $$-CH_3$$
  • $$-Cl$$
Which of following can have vacant $$p-$$orbital?
  • $$^{ \bullet }{ C{ H }_{ 3 } }$$
  • $${ \overset { \oplus }{ CH } }_{ 3 }$$
  • $$CH_4$$
  • Both $$(B)$$ and $$(C)$$
The compound that does not produce nitrogen has by the thermal decomposition is:
  • $$NH_4NO_2$$
  • $$(NH_4)_2SO_4$$
  • $$Ba(N_3)_2$$
  • $$(NH_4)_2Cr_2O_7$$
$${ p }_{ \pi  }-{ d }_{ \pi  }\quad $$ back bonding cannot occur in:
  • $$N{ \left( Si{ H }_{ 3 } \right) }_{ 3 }$$
  • $${ PF }_{ 3 }\quad $$
  • $$As{ F }_{ 3 }$$
  • $${ BF }_{ 3 }$$
$${N}_{2}$$ is estimated in organic compound by
  • Duma's method
  • Carius method
  • Lassaigne's method
  • None of these
The derived name of the above compound is:
792048_7eff402fe3f64d6bbfef8a844de715e4.png
  • t-Butyl ethyl methyl carbinol
  • t-Butyl ethylethanol
  • t-Butyl ethyl methyl methanol
  • none of these
Which of the following do not contain carbon - oxygen double bonds?
  • Ketone
  • Esters
  • Acids
  • Ethers
If a mixture of methane, ammonia and oxygen is passed over pt-gauge at $$700^\circ {\text{C}}$$ then the product will be:
  • HCOOH
  • HCN
  • $${\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{H}}_{\text{2}}}$$
  • All of these
How many different functional groups are present in given compound?

973051_f6d08193ee6645e8bb5268203e8a959a.png
  • 3
  • 4
  • 1
  • 5
0.5g of an organic compound was Kjeldahlised and the ammonia evolved was absorbed in 50 mL of 0.5M $$H_2SO_4$$. The residual acid required 60 mL of 0.5M NaOH.The percentage of nitrogen in the organic compound is:
  • $$14\%$$
  • $$28\%$$
  • $$56\%$$
  • $$42\%$$
Which of the following compounds gives blood red colouration when its Lassaignes extract is treated with alkali and ferric chloride?
  • Thiourea
  • Diphenyl sulphide
  • Phenyl hydrazine
  • Benzamide
The compound $$C_2FClBrI$$ has:
  • 4 geometrical isomers
  • 6 geometrical isomers
  • 4 optical isomers
  • (B) and (C) both
The correct name for is :-
1070280_461b4d4a27d04c6bbdfcf7489a552249.png
  • $$2-Hydroxy\ cyclopentan-1-al$$
  • $$2-Formyl-1hudroxy cyclopentane$$
  • $$2-Hydroxy cyclopentane carbaldehyde$$
  • $$Cyclopentane -2-ol-1-al$$
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