Unit 10: Alkyl Halides

41. The reaction of an alkyl halide with a strong nucleophile typically follows:

a) SN1 mechanism
b) SN2 mechanism
c) E1 mechanism
d) E2 mechanism
Answer: b) SN2 mechanism

42. The most common type of isomerism shown by alkyl halides is:

a) Geometric isomerism
b) Optical isomerism
c) Chain isomerism
d) Functional group isomerism
Answer: c) Chain isomerism

43. The reaction in which a halogen is replaced by a hydroxyl group is called:

a) Halogenation
b) Substitution
c) Elimination
d) Hydrogenation
Answer: b) Substitution

44. The type of alkyl halide that is least likely to undergo SN2 reactions is:

a) Primary alkyl halide
b) Secondary alkyl halide
c) Tertiary alkyl halide
d) Aromatic alkyl halide
Answer: c) Tertiary alkyl halide

45. The reagent used for the synthesis of alkyl iodides from alcohols is:

a) Sodium iodide
b) Sodium chloride
c) Sodium bromide
d) Sodium sulfate
Answer: a) Sodium iodide

46. In an SN1 reaction, the rate-determining step is:

a) Formation of the carbocation
b) Attack by the nucleophile
c) Formation of the alkyl halide
d) Decomposition of the leaving group
Answer: a) Formation of the carbocation

47. The effect of increasing the size of the leaving group in an SN2 reaction is:

a) Increased reaction rate
b) Decreased reaction rate
c) No effect on the reaction rate
d) No effect on the product distribution
Answer: a) Increased reaction rate

48. The reagent used to test for the presence of alkyl chlorides is:

a) Silver nitrate
b) Sodium bromide
c) Sodium iodide
d) Sodium hydroxide
Answer: a) Silver nitrate

49. The process of converting an alkyl halide to an alkene with a base is known as:

a) Substitution reaction
b) Elimination reaction
c) Addition reaction
d) Hydrogenation
Answer: b) Elimination reaction

50. The reaction of alkyl halides with zinc in the presence of iodine yields:

a) Alkanes
b) Alkenes
c) Alkynes
d) Aromatic compounds
Answer: a) Alkanes