(a) Why are haloalkanes more reactive towards nucleophilic substitution reactions than haloarenes and vinylic halides?

(b) Name the possible alkenes which will yield 1-chloro-1-methylcyclohexane on their reaction with HCl. Write the reactions involved.

OR

(a) Allyl chloride is hydrolyzed more readily than n-propyl chloride. Why?

(b) Identify the major product formed when 2-cyclohexylchloroethane undergoes a dehydrohalogenation reaction. Name the reagent, which is used to carry out the reaction.