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Preparation of Alcohols from Alkenes

A nitrogenaou...

Question

A nitrogenaous compound with molecular mass $180 g/mol$ shows an increase in molecular mass to $348 g/mol$ on treatment with a acetyl chloride. The number of possible $N H_{2}$ groups in the molecule is:

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Solution

The reaction involes is as follow:
$- N H_{2} + C l - O | | C - C H_{3} \to - N H - O | | C - C H_{3}$

For one $- N H_{2}$ group, increase in molecular mass
$= (43 - 1) g/mol = 42 g/mol$
$Molcular mass of C H_{3} C O = 43 g/mol Atomic mass of H = 1 g/mol$

Actual increase in molecular mass of compound
$= (348 - 180) g/mol = 168 g/mol$

$∴ No. of N H_{2} = 168 / 42 = 4$

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