Learn how to quickly and easily distinguish SN1 vs. SN2 reactions , with particular regard to nucleophiles, solvent, and electrophiles. Learn SN1 and SN2 reaction mechanisms, key differences, and tips to identify the right pathway for JEE and boards. Includes examples, comparison, and exam practice. SN1 (Substitution Nucleophilic Unimolecular) Mechanism In SN1 reactions , the word "SN" stands for "nucleophilic substitution", and "1" means that the rate-determining step is unimolecular in nature. In other words, a stronger nucleophile displaces a weaker one via the formation of an intermediate. Learn the key differences between SN1 and SN2 reactions , including their mechanisms, rates, and factors affecting each type.
