An organic compound A ( mol wt = 180) is acylated with `CH_3 COCl` to get acylated compound of mol wt. 390. What is the number of amino groups present per molecule of the compound A?

Options

A. 2
B. 5
C. 4
D. 6

Answer

B

Explanation

Change in molecular mass =42 per `NH_(2)`
180 molecular mass after acylation gives compound of molecular mass 390
Change in molecular mass =390-180=210
so number of `NH_(2)` group `=(210)/(42)=5`