A compound $(x)$ with molar mass $108 \mathrm{~g} \mathrm{~mol}^{-1}$ undergoes acetylation to give product with molar mass $192 \mathrm{~g} \mathrm{~mol}^{-1}$. The number of amino groups in the compound $(\mathrm{x})$ is . . . .. .
A$10$
B$11$
C$2$
D$4$
JEE MAIN 2024, Difficult
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C$2$
c Image
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 $\mathrm{x}=\frac{84}{42}=2$
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