Question

A compound with molecular mass 180 is acylated with $C{H}_{3}COCl$ 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

The correct option is B 5


Each group increases the molecular mass by 42.
$\therefore$ Total increase in molecular mass = 390 – 180 = 210
$\therefore$ No. of $N{H}_2$ groups = $\frac{210}{42}=5$