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


7.
Which type of alkyl halide undergoes an SN1 reaction?
A.
Tertiary alkyl halide
B.
Primary alkyl halide
C.
Secondary alkyl halide
D.
None of the above
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ANSWER :
A. Tertiary alkyl halide
8.
Which of the following is the best leaving group in nucleophilic substitution?
A.
Iodine
B.
Chlorine
C.
Fluorine
D.
Bromine
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ANSWER :
A. Iodine
9.
Which of the following is a characteristic of an SN2 reaction?
A.
Rearrangement of the intermediate
B.
One-step mechanism
C.
Carbocation formation
D.
Two-step mechanism
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ANSWER :
B. One-step mechanism
10.
Which of the following halides is least reactive in an SN2 reaction?
A.
Chloromethane
B.
Iodomethane
C.
Fluoromethane
D.
Bromomethane
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ANSWER :
C. Fluoromethane
11.
Which of the following statements is true for the SN1 mechanism?
A.
Only one species is involved in the rate-determining step
B.
There is no formation of a carbocation
C.
Two nucleophilic species are involved
D.
Carbocation formation is involved
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ANSWER :
A. Only one species is involved in the rate-determining step
12.
Which of the following factors favors an SN1 reaction?
A.
Strong nucleophile
B.
Polar protic solvent
C.
High concentration of nucleophile
D.
None of the above
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ANSWER :
B. Polar protic solvent