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 ________.

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TestHub · Accepted Answer

The compounds like amines and alcohols undergo acetylation with acetyl chloride. During this reaction, one proton of amine or alcohol is replaced with one acetyl group( ${CH}_{3} CO -$ ).

The molar mass of the acetyl group is $43 g / mol$ . The increase in molar mass due to one acetyl group is $43 - 1 = 42 g / mol$ .

The molar mass of reactant is $108 g / mol$ . The molar mass of product is $192 g / mol$ . The change in mass is $84 .$

Hence, the number of acetyl groups $= \frac{84}{42} = 2$

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