Organic Chemistry

Nucleophile is electron rich or negatively charged species. and are weaker nucleophile because they don't have negative charge. The strength of , decreases due to presence of benzyl group which withdraws electrons from oxygen due to effect. is strongest nucleophile because methyl group increases the electron density on oxygen, since it shows effect.

As the number of alkyl groups attached to the carbon containing odd electron increases, number of hyperconjugative structures increases, and thus, the stability increases. due to lack of alkyl group, attached to the , is least stable.