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Organic Chemistry Multiple Choice Questions and Answers – Nucleophilic Substitution Reaction

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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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

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?

[A] I and III
[B] II and IV
[C] I and II
[D] I, II and IV
Answer: I and II

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(3) SN1 reaction undergoes through a carbocation intermediate as follows:

[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?

[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?

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (a)
(6) Which of the following curve correctly represents SN1 vs SN2?

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (b)
(7) Which configuration will be adopted by X and Y respectively?

[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?

[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?

[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?

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (b)

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