A compound of molecular weight 180 is acetyla | vedclass

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(C) The acetylation reaction involves the replacement of a hydrogen atom in the $-NH_2$ group with an acetyl group $(-COCH_3)$.The increase in molecul

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$5$

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(C) The acetylation reaction involves the replacement of a hydrogen atom in the $-NH_2$ group with an acetyl group $(-COCH_3)$.The increase in molecular weight per $-NH_2$ group is the difference between the mass of the acetyl group $(-COCH_3 = 12 + 16 + 12 + 3 = 43)$ and the hydrogen atom replaced $(H = 1)$.Increase in mass per group $= 43 - 1 = 42$.Total increase in molecular weight $= 390 - 180 = 210$.Number of $-NH_2$ groups $= \frac{210}{42} = 5$.

$A$ compound of molecular weight $180$ is acetylated to give a compound of molecular weight $390$. The number of amino groups in the initial compound is:

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