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 ____.

JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Compounds Containing Nitrogen

A compound (x) with molar mass

108 g mol^{- 1}

undergoes acetylation to give product with molar mass

192 g mol^{- 1}

. The number of amino groups in the compound

(x)

is ____.

Answer: 2

Acetylation converts each

- N H_{2}

group to

- NHCOC H_{3}

, replacing one H (mass 1) with an acetyl group

COC H_{3}

(mass 43) — a net gain of 42 in molar mass per amino group.

Total increase in molar mass

= 192 - 108 = 84

Number of amino groups

= \frac{84}{42} = 2

JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Integer answer