Gain in molecular weight after acylation with one \(-\mathrm{NH}_2\) group is 42 .
Total increase in molecular weight \(=84\)
\(\therefore\) Number of amino group in \(\mathrm{x}=\frac{84}{42}=2\)
(આપેલ : આણ્વિય દળ : $C : 12.0\, u , H : 1.0 \,u,N : 14.0\, u , O : 16.0\, u , Cl : 35.5\, u )$