Common Types of Organic Reactions(Substitution, Addition, Elimination, and Rearrangement) NEET Questions

Organic Chemistry - Some Basic Principles of Organic Chemistry

Common Types of Organic Reactions(Substitution, Addition, Elimination, and Rearrangement) MCQ Questions


7.
Which of the following reactions involves a carbocation intermediate?
A.
SN2
B.
E2
C.
SN1
D.
All of the above
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ANSWER :
C. SN1
8.
In an SN2 reaction, the nucleophile attacks:
A.
From the same side as leaving group
B.
From the opposite side of leaving group
C.
Randomly
D.
From above the plane
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ANSWER :
B. From the opposite side of leaving group
9.
Which of the following is a rearrangement reaction?
A.
Pinacol–pinacolone rearrangement
B.
Williamson ether synthesis
C.
Grignard reaction
D.
Wurtz reaction
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ANSWER :
A. Pinacol–pinacolone rearrangement
10.
The major product of E1 elimination is:
A.
Least substituted alkene
B.
Most substituted alkene
C.
Alkyne
D.
Alcohol
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ANSWER :
B. Most substituted alkene
11.

Which of the following reactions is an example of electrophilic substitution?

A.

C6H6 + Br2 → C6H5Br + HBr

B.

CH3CH=CH2 + HBr → CH3CHBrCH3

C.

CH3CH2OH → CH3CHO + H2

D.

C2H5Br + OH− → C2H5OH

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ANSWER :

A. C6H6 + Br2 → C6H5Br + HBr

12.
Which of the following is not a characteristic of SN1 reactions?
A.
First-order kinetics
B.
Carbocation intermediate
C.
Rate depends on nucleophile
D.
Rearrangement possible
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ANSWER :
C. Rate depends on nucleophile