Nature of C-X Bond; Mechanisms of Substitution Reactions NEET Questions

Organic Chemistry - Organic Compounds Containing Halogens

Nature of C-X Bond; Mechanisms of Substitution Reactions MCQ Questions


13.
In SN2 reaction, the transition state has:
A.
A neutral carbon with four bonds
B.
Carbon partially bonded to five atoms with three C-H bonds in same plane
C.
A free carbocation intermediate
D.
A carbanion intermediate
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ANSWER :
B. Carbon partially bonded to five atoms with three C-H bonds in same plane
14.
The kinetics of SN2 reaction follows:
A.
Zero order kinetics: Rate = k
B.
Third order kinetics: Rate = k[RX]²[Nu⁻]
C.
Second order kinetics: Rate = k[RX][Nu⁻]
D.
First order kinetics: Rate = k[RX]
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ANSWER :
C. Second order kinetics: Rate = k[RX][Nu⁻]
15.
SN2 reaction of an optically active alkyl halide is accompanied by:
A.
Inversion of configuration
B.
Retention of configuration
C.
No change in configuration
D.
Racemisation
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ANSWER :
A. Inversion of configuration
16.
Which alkyl halide will undergo SN2 reaction fastest?
A.
(CH₃)₃CCH₂Br (neopentyl bromide)
B.
(CH₃)₃CBr
C.
(CH₃)₂CHBr
D.
CH₃CH₂CH₂Br
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ANSWER :
D. CH₃CH₂CH₂Br
17.
The term 'Walden inversion' is associated with:
A.
SN1 reactions of tertiary alkyl halides
B.
Free radical halogenation
C.
SN2 reactions of chiral alkyl halides
D.
E2 elimination reactions
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ANSWER :
C. SN2 reactions of chiral alkyl halides
18.
In SN2 mechanism, the reaction proceeds through:
A.
Two steps with a carbocation intermediate
B.
Multiple steps via free radicals
C.
Three steps with a carbanion intermediate
D.
A single concerted step with one transition state
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ANSWER :
D. A single concerted step with one transition state