Unit 10: Alkyl Halides

11. Alkyl halides are compounds that contain:

a) An alkyl group and a hydroxyl group
b) An alkyl group and a halogen
c) A carbonyl group and a halogen
d) An alkyl group and an amino group
Answer: b) An alkyl group and a halogen

12. The general formula for an alkyl halide is:

a) R–X
b) R–OH
c) R–NH₂
d) R–COOH
Answer: a) R–X

13. In alkyl halides, the halogen atom is typically bonded to:

a) A sp² hybridized carbon
b) A sp³ hybridized carbon
c) A sp hybridized carbon
d) An aromatic ring
Answer: b) A sp³ hybridized carbon

14. The reactivity of alkyl halides increases with:

a) Increasing size of the halogen
b) Decreasing size of the halogen
c) Increasing size of the alkyl group
d) Decreasing size of the alkyl group
Answer: a) Increasing size of the halogen

15. The common method to prepare alkyl halides is by:

a) Hydrolysis of alcohols
b) Dehydration of alcohols
c) Halogenation of alkanes
d) Hydrogenation of alkenes
Answer: c) Halogenation of alkanes

16. In the reaction of alkyl halides with nucleophiles, the process is known as:

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

17. The primary type of reaction undergone by alkyl halides in the presence of a strong base is:

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

18. The best reagent for converting an alkyl halide to an alcohol is:

a) Sodium hydroxide
b) Sulfuric acid
c) Hydrogen chloride
d) Potassium permanganate
Answer: a) Sodium hydroxide

19. In the SN1 mechanism, the rate-determining step involves:

a) The formation of a carbocation
b) The attack of the nucleophile
c) The formation of a haloalkane
d) The breaking of the carbon-halogen bond
Answer: a) The formation of a carbocation

20. The SN2 reaction mechanism is characterized by:

a) A single-step process
b) A two-step process
c) The formation of a carbocation intermediate
d) A racemization of products
Answer: a) A single-step process