CSIR-NET Chemical Science - ORGANIC CHEMISTRY MCQ - Attempt Here!

By Astha Singh|Updated : June 20th, 2022

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Multiple Choice Questions On Organic Chemistry

Question 1.

The incorrect statement amongst the following about the Paterno-Büchi Reaction is:

The photocycloaddition of ketones to electron-rich alkenes involves an attack on ground state alkene by the n →π* triplet state of the carbonyl compound.
Photocycloaddition of aliphatic ketones to electron-deficient alkenes particularly involves the addition of singlet state (n → π*) excited ketone to ground state alkene.
The reaction is stereospecific and the stereochemistry of the alkene is retained in the product.
None Of These

Question 2.

In the mass spectrum of 1-Bromo-2-chloro ethane, the approximate ratio of relative intensities of peaks at m/z 142,144 and 146 will be:

9 : 6: 2
2: 4 : 3
1: 2: 2
3 : 4: 1

Question 3.

The reduction of dinitrogen to ammonia in an ATP-dependent reaction is carried out by:

Nitrogenase enzyme
Catalase enzyme
Liver alcohol dehydrogenase
Amylase

Question 4.

The incorrect statements from the following are:

i. The chemical properties of diastereomers in the achiral medium are always different

ii. The chemical properties of enantiomers in an achiral medium are different

iii. Enantiomers rotate plane polarised light in the same direction

iv. Geometrical isomers are always enantiomers

i, ii and iii
iii and iv
ii, iii and iv
i and iv

Question 5.

The degree of polymerization is 20. The fraction of Monomer consumed is

0.05
0.95
0.05
0.10

Question 6.

The correct statement about the Claisen rearrangement reaction is:

A) Claisen rearrangement is a [2,3] sigmatropic shift of allyl vinyl ethers in aliphatic as well as aromatic substrates.

B) Claisen rearrangements are stereoselective owing to the chair form transition state.

C) Claisen rearrangement is feasible at room temperature in the presence of Trifluoroethanol.

D) Lewis’s acids can enhance the rate of the reactions and lower the temperature required to bring the transformations.

B and D
A and C
A, B and C
B, C and D

Question 7.

What intermediate is involved in the conversion of compound B to compound C?

Secondary Carbocation
Tertiary Carbanion
Secondary radical
Tertiary Carbocation

Question 8.
If the carbon being pointed to was deprotonated (resulting in a positive charge on it). Would the resonance form (the positive charge being redistributed to the carbon with bromine) be more stable than a secondary carbocation?
A. No, because bromine's bulky electron cloud will interfere
B. No, because bromine is an electrophile
C. Yes, because bromine is an electrophile
D. Yes, because bromine donates some electrons
Question 9.
If you have a 2^o carbocation next to a tertiary carbon that has hydrogen, what is the possible shift?

A. 1,2-hydride shift
B. 1,2-alkyl shift
C. Both are possible
D. No shift is observed
Question 10.
Which among the following has the highest nucleophilicity?

A. F^-
B. OH^-
^{^C.}CH₃^-
^{^D.}NH₂^-

Answer Key For Organic Chemistry
Question Number	Answer Key
1	D
2	D
3	A
4	C
5	C
6	D
7	D
8	B
9	A
10	C

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