Among the following the most reactive towards alcoholic KOH is

Alkyl halide undergoes both substitution reaction and elimination reaction. In a nucleophilic substitution reaction, the one-step reaction is called the N S 2 reaction. It is a bimolecular nucleophilic substitution reaction where the rate of reaction depends on the concentration of nucleophile and substrate. Here base can act as a nucleophile. For example, the hydroxide ion is a good nucleophile. In E2 the elimination reaction, the nucleophile that the hydroxide ion acts as a base and abstracts a proton and favors the reaction. Therefore, N S 2 and E2 are compatible. Similarly, the N S 1 rea