Question

A compound with molecular mass `180` is acylated with `CH_(3)COCI` to get a compound with molecule of the fomer compound is .
A. 5
B. 4
C. 6
D. 2

Answer 1

Correct Answer - A
let s consider the possible reaction:
`-NH_(2)+CH_(3)COCIrarr-NH-COCH_(3)+HCI`
Since one active `H` atom from every possible amino group is substituted by `CH_(3)CO-` group the molecular mass will increase by `(-1 +43 =42u)` for every such substitutions Total increase in molecular mass
`= 390 - 180 = 120`
Thus the corred no of amino groups present per molecule of the compounds wil be
`= (120)/(42) = 5` .