A compound with molecular mass 180 is acylated with `CH_(3)COCl` to get a compound with molecular mass 390. The number of amino groups present per molecule of the former compound is:

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`