Organic Chemistry Multiple Choice Questions and Answers – Nucleophilic Substitution Reaction

Questions
1 Which of the following compound shows the correct decreasing order of solvolysis with aqueous ethanol?

Organic Chemistry MCQ

The correct choice is:

A III > II > I > IV
B III > II > IV > I
C II > III > IV > I
D III > I > IV > II

Answer: III > II > IV > I
2 Which of the following reaction will go faster if the concentration of the nucleophile is raised?

Organic Chemistry MCQ

A I and III
B II and IV
C I and II
D I, II and IV

Answer: I and II
3 SN1 reaction undergoes through a carbocation intermediate as follows:

Organic Chemistry MCQ

[R = t-Bu, iso-Pr, Et, Me] (X = Cl, Br, I)

The correct statements are:

I. The decreasing order of rate of SN1reaction is t-BuX > iso-PrX > EtX > MeX

II. The decreasing order of ionization energy is MeX > EtX > iso-PrX > t-BuX

III. The decreasing order of energy of activation is t-BuX > iso-PrX > EtX > MeX

A I & II are correct
B I & III are correct
C II and III are correct
D I, II & III are correct

Answer: I & II are correct
4 Which statement is incorrect about the following reaction?

Organic Chemistry MCQ

A The rate of these reaction depends on both [R—I] and [131I-]
B Loss of optical activity was twice as fast as the gain of radioactivity
C Each molecule undergoing substitution suffers Inversion of configuration
D The Final solution has radioactive iodine only

Answer: The Final solution has radioactive iodine only
5 Which one is an excellent substrate for SN2 reaction?

Organic Chemistry MCQ

A (a)
B (b)
C (c)
D (d)

Answer: (a)
6 Which of the following curve correctly represents SN1 vs SN2?

Organic Chemistry MCQ

Organic Chemistry MCQ

A (a)
B (b)
C (c)
D (d)

Answer: (b)
7 Which configuration will be adopted by X and Y respectively?

Organic Chemistry MCQ

A R, R
B R, S
C S, S
D S, R

Answer: R, S
8 What will be the correct order of SN2/E2 ratio for the %yield of the product of the following halide?

Organic Chemistry MCQ

A III > IV > II > I
B III > II > IV > I
C I > III > IV > II
D II > I > III > IV

Answer: III > IV > II > I
9 Which of the following is an incorrect statement?

Organic Chemistry MCQ

A Rate of formation of (II) and (IV)would be identical
B Rate of formation of (I) would be slower than that of (III)
C Formation of (I) would show primary isotope effect
D Formation of (III) involves E1 reaction

Answer: Formation of (III) involves E1 reaction
10 Which of the following type of reaction shows heterolytic bond cleavage?

Organic Chemistry MCQ

A (a)
B (b)
C (c)
D (d)

Answer: (b)
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