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


13.
In E2 mechanism, the base abstracts a proton:
A.
From the same carbon as leaving group
B.
From the adjacent carbon
C.
From any carbon
D.
From the carbon farthest from leaving group
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ANSWER :
B. From the adjacent carbon
14.
Which of the following is an example of nucleophilic addition?
A.
CH3CHO + HCN → CH3CH(OH)CN
B.
C6H6 + Cl2 → C6H5Cl + HCl
C.
CH3CH2OH → CH3CHO + H2
D.
CH3CH=CH2 + HBr → CH3CHBrCH3
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ANSWER :
A. CH3CHO + HCN → CH3CH(OH)CN
15.
The rearrangement in carbocation occurs to:
A.
Form more stable carbocation
B.
Form less stable carbocation
C.
Increase reaction rate
D.
Decrease reaction rate
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ANSWER :
A. Form more stable carbocation
16.
Which of the following undergoes SN2 reaction most readily?
A.
(CH3)3CBr
B.
CH3CH2Br
C.
CH3CH2CH2Br
D.
CH3Br
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ANSWER :
D. CH3Br
17.
Which of the following is a characteristic of SN2 reactions?
A.
Carbocation intermediate
B.
Rate depends only on substrate
C.
Backside attack
D.
Rearrangement possible
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ANSWER :
C. Backside attack
18.
Which of the following reactions is an example of elimination?
A.
CH3CH2Br + KOH → CH2=CH2 + KBr + H2O
B.
CH3CH2Br + NH3 → CH3CH2NH2 + HBr
C.
CH3CH=CH2 + HBr → CH3CHBrCH3
D.
CH3CH2OH → CH3CHO + H2
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ANSWER :
A. CH3CH2Br + KOH → CH2=CH2 + KBr + H2O