MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Gabriel phthalimide synthesis is used exclusively for the preparation of primary aliphatic amines. Phthalimide on treatment with ethanolic potassium hydroxide forms the potassium salt of phthalimide, which on heating with an alkyl halide followed by alkaline hydrolysis produces the corresponding primary amine. Aromatic primary amines like C _6 H _5 NH _2 cannot be prepared by this method because aryl halides do not undergo nucleophilic substitution with the phthalimide anion. Secondary and tertiary amines like ( CH _3)_2 NH and C _2 H _5 N ( CH _3)_2 cannot be prepared by this method. Among the given options, C _2 H _5 NH _2 is the only primary aliphatic amine and can be prepared by Gabriel phthalimide synthesis. Answer: C _2 H _5 NH _2