In which of the following reaction is the rate of reaction not affected by increasing concentration of nucleophile?

Explanation

Option A: SN2 (substitution nucleophilic bimolecular) reaction: The rate of an SN2 reaction is influenced by the concentration of the nucleophile. As the concentration of the nucleophile increases, the rate of the reaction also increases.Option B: E2 (elimination bimolecular) reaction: Similar to the SN2 reaction, the rate of an E2 reaction is affected by the concentration of the nucleophile. As the concentration of the nucleophile increases, the rate of the reaction also increases.Option C: SN1 (substitution nucleophilic unimolecular) reaction: The rate of an SN1 reaction is not affected by the concentration of the nucleophile. The rate-determining step in an SN1 reaction involves the formation of a carbocation intermediate, which is independent of the concentration of the nucleophile. The rate of the reaction is primarily determined by the stability of the carbocation intermediate. Option D: This option suggests that none of the given reactions have a rate that is unaffected by increasing the concentration of the nucleophile. However, the correct answer is C).