Q50 / 71 · NTA Abhyas (JEE Main) 2020 · Chemistry · Amines

A compound with molecular mass 180 is acylated with CH3COCl to get a compound with molecular mass 390. The number of amino groups present per molecule of the former compound is

Correct answer: 5

Solution

R-NH2M+CH3COCl→RNHCOCH3M+42+HCl

If the increase in molecular mass is 42, the reactant has one NH2 group.

Actual increase in molecular mass =390-180=210

Number of NH2 groups =21042=5

Hence, the correct answer is 5.

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