Practice MCQ For Govt Pharmacist Exam, in this article we will solve, Practice MCQ on the topic, SN1 and SN2 reactions under the subject Pharmaceutical organic chemistry of second semester. Read following article for your reference.
Which of the following reactions proceeds via a carbocation intermediate?
A) SN1
B) SN2
C) Both
D) Neither
In an SN2 reaction, the rate depends on:
A) Concentration of the nucleophile
B) Concentration of the substrate
C) Both nucleophile and substrate concentrations
D) Temperature
Which type of reaction involves simultaneous bond breaking and bond making?
A) SN1
B) SN2
C) Both
D) Neither
In SN2 reactions, the nucleophile approaches from which side of the leaving group?
A) Frontside
B) Backside
C) Both equally
D) It depends on the solvent
What is the stereochemical outcome of an SN2 reaction?
A) Retention of configuration
B) Inversion of configuration
C) Racemization
D) No change in configuration
Which alkyl halide is most reactive in SN2 reactions?
A) Methyl halide
B) Primary alkyl halide
C) Secondary alkyl halide
D) Tertiary alkyl halide
In SN1 reactions, carbocation rearrangements occur due to:
A) Steric hindrance
B) Hyperconjugation
C) Resonance stabilization
D) All of the above
Which solvent is typically favored in SN1 reactions?
A) Polar protic
B) Polar aprotic
C) Nonpolar
D) Water
Which of the following alkyl halides is most likely to undergo an SN1 reaction?
A) CH₃Cl
B) CH₃CH₂Cl
C) (CH₃)₂CHCl
D) (CH₃)₃CCl
What is the order of reactivity of alkyl halides in SN1 reactions?
A) Tertiary > Secondary > Primary
B) Primary > Secondary > Tertiary
C) Secondary > Tertiary > Primary
D) It depends on the solvent
Which type of reaction involves a single-step mechanism?
A) SN1
B) SN2
C) Both
D) Neither
In SN2 reactions, the nucleophile attacks the substrate from which direction?
A) Frontside
B) Backside
C) Both equally
D) It depends on the leaving group
Which alkyl halide is least likely to undergo an SN2 reaction?
A) CH₃Cl
B) CH₃CH₂Cl
C) (CH₃)₂CHCl
D) (CH₃)₃CCl
What is the stereochemical outcome of an SN1 reaction?
A) Retention of configuration
B) Inversion of configuration
C) Racemization
D) No change in configuration
Which solvent is typically favored in SN2 reactions?
A) Polar protic
B) Polar aprotic
C) Nonpolar
D) Water
Which of the following alkyl halides is most likely to undergo an SN2 reaction?
A) CH₃Cl
B) CH₃CH₂Cl
C) (CH₃)₂CHCl
D) (CH₃)₃CCl
What is the order of reactivity of alkyl halides in SN2 reactions?
A) Tertiary > Secondary > Primary
B) Primary > Secondary > Tertiary
C) Secondary > Tertiary > Primary
D) It depends on the solvent
Which type of reaction involves a single-step mechanism?
A) SN1
B) SN2
C) Both
D) Neither
In SN2 reactions, the nucleophile attacks the substrate from which direction?
A) Frontside
B) Backside
C) Both equally
D) It depends on the leaving group
Which type of solvent is typically favored in SN1 reactions?
A) Polar protic
B) Polar aprotic
C) Nonpolar
D) Water
Which type of reaction proceeds via a carbocation intermediate?
A) SN1
B) SN2
C) Both
D) Neither
In an SN2 reaction, the rate depends on:
A) Concentration of the nucleophile
B) Concentration of the substrate
C) Both nucleophile and substrate concentrations
D) Temperature
What is the stereochemical outcome of an SN2 reaction?
A) Retention of configuration
B) Inversion of configuration
C) Racemization
D) No change in configuration
Which solvent is typically favored in SN1 reactions?
A) Polar protic
B) Polar aprotic
C) Nonpolar
D) Water
How does the number of R groups affect an SN2 reaction?
A) As the degree of the alkyl halide increases, SN2 reactivity increases.
B) As the degree of the alkyl halide increases, SN2 reactivity decreases.
C) SN2 reactivity remains constant regardless of the degree of the alkyl halide.
D) SN2 reactivity is unrelated to the number of R groups.
Which type of reaction involves a single-step mechanism?
A) SN1
B) SN2
C) Both
D) Neither
In SN2 reactions, the nucleophile attacks the substrate from which direction?
A) Frontside
B) Backside
C) Both equally
D) It depends on the leaving group
Which of the following is the common name for ethyl chloride?
A) Allyl bromide
B) Vinyl bromide
C) Ethylidene chloride
D) Vic-dichloride
Chloroform is widely used as a solvent. Which of the following statements about chloroform is incorrect?
A) It is non-flammable.
B) It has a chloroform-like pleasant mild smell.
C) It is highly soluble in water.
D) It is used as an anaesthetic.
What is the molecular weight of trichloroethylene?
A) 131.5
B) 130.5
C) 129.5
D) 120.5
Which of the following chemical reactions involving tetrachloroethylene is true?
A) C2H2 + 2Cl2 → C2H2Cl2
B) C2H2 + 2Cl2 → C2H2Cl4
C) C2H2Cl4 → C2HCl3 + HCl
D) C2H2Cl4 + FeCl3 → C2HCl3 + HCl
What is the common name for the compound H3C-CHCl2?
A) 1,2-Dichloroethane
B) Ethylene dichloride
C) Ethylidene chloride
D) Vic-dichloride
Tetrachloromethane is used primarily as a cleaning solvent and as a chemical precursor for fluorocarbons. Which of the following statements about its uses is incorrect?
A) It is used in transformers.
B) It is used in paint removers.
C) It is used in aerosol formulations.
D) It is used as an anthelmintic.
Which of the following compounds will undergo racemization when it reacts with aqueous KOH?
A) (i) and (ii)
B) (ii) and (iv)
C) (iii) and (iv)
D) (iv)
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