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A compound with molecular mass 180 is acetylated to get a compound with molecular mass 390. The number of amino groups present per molecule of the former compound is

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answer is B.

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Detailed Solution

Increase in mwt after acetylation of one Amine is group = 42

$\begin{array}{l} ∴ 390 - 180 = 210 \\ e a c h a c e t y l g r o u p h a s a m a s s o f 43 b u t \sin c e i t r e p l a c e s o n e h y d r o g e n n e t w e i g h t a d d e d w i l l b e 42 \\ \frac{210}{42} = 5 \end{array}$

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