MHT CET 2026 Chemistry question

Identify the major product obtained when ethyl amine is reacted with excess of methyl iodide ?

(A)Tetramethylammonium iodide
(B)Ethyltrimethylammonium iodideCorrect
(C)Ethyldimethylamine
(D)Ethylmethylamine

Answer: (B)

Solution

Alkyl halides react with amines by nucleophilic substitution (Hofmann alkylation). With excess the reaction goes on step by step: C_2H_5NH_2 \to C_2H_5NHCH_3 \to C_2H_5N(CH_3)_2 \to [C_2H_5N(CH_3)_3]^+ I^-. The final stage is the quaternary ammonium salt,

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Question ID VK-100133