A hydroxy compound (X) with molar mass 122 g | vedclass

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(D) During acetylation, each $-OH$ group is replaced by an $-OCOCH_3$ group. This results in the replacement of one hydrogen atom (mass $1 \ u$) with

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$4$

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(D) During acetylation, each $-OH$ group is replaced by an $-OCOCH_3$ group. This results in the replacement of one hydrogen atom (mass $1 \ u$) with an acetyl group ($-COCH_3$, mass $43 \ u$). Therefore, the net increase in molar mass for each $-OH$ group is $43 - 1 = 42 \ g \ mol^{-1}$. Let $n$ be the number of $-OH$ groups. The increase in molar mass is $290 - 122 = 168 \ g \ mol^{-1}$. Thus, $n 	imes 42 = 168$. $n = \frac{168}{42} = 4$. So, there are $4$ hydroxyl groups present in compound $(X)$.

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