Nucleophilic Substitution Reaction MCQs

By: Prof. Dr. Fazal Rehman | Last updated: November 27, 2024

1. Which of the following is the functional group in alkyl halide?
(A). Hydroxyl group
(B). Inert gas
(C). Halogen atom
(D). All of these
(E). None of these
Multiple Choice Question Answer: c

2. What is the halide ion?
(A). Strong base
(B). Weak acid
(C). Weak base
(D). Strong acid
(E). None of these
Multiple Choice Question Answer: c

3. Which of the following is the atom that defines the structure of a family of organic compounds and their properties?
(A). Functional group
(B). Homologous structure
(C). Resonating structure
(D). Nucleophile
(E). None of these
Multiple Choice Question Answer: a

4. Which of the following is the correct statement?
(A). All of these
(B). No intermediate is always involved in the SN2 mechanism
(C). SN2 reactions are a one-step reaction
(D). SN2 reaction always follows the second-order kinetics
(E). None of these
Multiple Choice Question Answer: a

5. When the nucleophile: OR attacks the RX, which of the following will be the resultant product?
(A). R – OH
(B). R: CN
(C). ROR
(D). RNHR
(E). None of these
Multiple Choice Question Answer: c

6. Which of the following is the reactivity order of alkyl halides in SN2?
(A). CH3 X > 20 > 10 > 30
(B). CH3 X > 20 > 10 > 30
(C). CH3 X > 10 > 20 > 30
(D). CH3 X > 30 > 10 > 20
(E). None of these
Multiple Choice Question Answer: c

7. The step in SN1 reaction that is a slow rate-determining step is __________
(A). Formation of a transition state
(B). Formation of a racemic mixture
(C). Attack of the nucleophile
(D). All of these
(E). None of these
Multiple Choice Question Answer: a

8. A low concentration of nucleophile favors which of the following?
(A). SN1 reaction
(B). SN2 reaction
(C). Both SN1 and SN2 reaction
(D). None of these
(E). None of these
Multiple Choice Question Answer: a

9. The reactions that are favored by the polar aprotic solvent are __________
(A). SN1 reaction
(B). Both SN1 reaction and SN2 reaction
(C). SN2 reaction
(D). None of these
(E). None of these
Multiple Choice Question Answer: c

10. The SN1 reaction is always involving the heterolysis to form carbocation as an intermediate.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: b

11. Which of the following is the reaction of alcohol with SOCl2?
(A). SN1
(B). SN2
(C). SNi
(D). SNAr
(E). None of these
Multiple Choice Question Answer: c

12. The drastic condition that is required for the substitution in haloarenes is ___________
(A). All of these
(B). High pressure
(C). Strong concentrated reagent
(D). High temperature
(E). None of these
Multiple Choice Question Answer: a

13. How will we arrange the following in the decreasing order of leaving group in the nucleophilic substitution reaction?
(A). Cl– > Br– > CH3COO– > HO– > H–
(B). Cl– > Br– > HO– > H– > CH3COO–
(C). H– > Cl– > HO– > Br– > CH3COO–
(D). H– > Cl– > HO– > Br– > CH3COO–
(E). None of these
Multiple Choice Question Answer: a

14. The rate of nucleophilic substitution reactions is higher in the presence of which of the following?
(A). Electron releasing groups
(B). Electron withdrawing groups
(C). Both electron-withdrawing and releasing groups
(D). None of these
(E). None of these
Multiple Choice Question Answer: b

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