A compound with molecular mass 180 is acylated with C H 3 C O C l 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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R - N H 2 M + C H 3 C O C l → R N H C O C H 3 M + 42 + H C l If the increase in molecular mass is 42, the reactant has one N H 2 group. Actual increase in molecular mass = 390 - 180 = 210 Number of N H 2 groups = 210 42 = 5

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