Question

A compound with molecular mass 180 is acylated with CH₃COCl to get a compound with molecular mass 390. The number of amino groups present per molecule of the former compound is :
(a) 2
(b) 5
(c) 4
(d) 6

Answer 1

Since,each-COCH3  group displaces one H atom in the reaction of one mole of CH3COCl with the one-NH2 group, the molecular mass increases with 42 units.

Since, the mass increases by (390-180) = 210, hence the number of -NH2
the group is 210/42 =5



Since,each-COCH3  group displaces one H atom in the reaction of one mole of CH3COCl with the one-NH2 group, the molecular mass increases with 42 units.

Since, the mass increases by (390-180) = 210, hence the number of -NH2
the group is 210/42 =5