Above reaction is known as nucleophilic substitution reaction. Bimolecular nucleophilic substitution reaction follows second-order kinetics. The rate of reaction depends on the concentration of two first-order reactants. Hydroxide ion (OH−)is stronger nucleophile than acetate ion as in acetate ion, the negative charge is involved in resonance with carboxylic group. Methoxide ion (CH3O−)is more nucleophilic than hydroxide ion (OH−)due to +I effect of methyl group. PhO⊖ is very weak nucleophile because the negative charge is in resonance with ring and charge further decreases. The order is