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A compound with molecular mass 180 is ac...

A compound with molecular mass 180 is acylated with `CH_(3)COCl` to get a compound with molecular mass 390. the number of amino groups present per molecule of the former compound is

A

2

B

5

C

4

D

6

Text Solution

Verified by Experts

The correct Answer is:
B
By reaction with one mole of `CH_3 - overset(O)overset(||)C - Cl` with one `- NH_2` group the molecular mass increases with 42 unit. Since the mass increases by (390 - 180) = 210 hence the number of `- NH_2` groups is 5.
`R - NH_2 + CH_3 - overset(O) overset(||)C - Cl underset(-HCl)to R - NH - overset(O)overset(||)C - CH_3`.
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