Which of the following amines forms a salt soluble in excess NaOH when treated with benzenesulphonyl chloride?
Primary amines like CH₃NH₂ form sulphonamides with benzenesulphonyl chloride that have an acidic hydrogen, making them soluble in excess NaOH in the Hinsberg test.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.