An amine (X) is prepared by ammonolysis of benzyl chloride. On adding p-toluenesulphonyl chloride to it the solution remains clear. Molar mass of the amine (X) formed is g mol-1. (Given molar mass in g mol-1 C : 12, H : 1, O : 16, N : 14)
Answer
287
Solution
∵ 1° and 2° amines (N–H present) react with p-toluenesulphonyl chloride to give a sulphonamide; a 3° amine has no N–H ⇒ no reaction ⇒ solution remains clear ⇒ X is a 3° amine
3C6H5CH2Cl + NH3 (C6H5CH2)3N + 3HCl
X = tribenzylamine, C21H21N
Molar mass = 21 12 + 21 1 + 14 = 287 g mol-1
Answer: 287