1.

Certain nitrogeneous compound with molecular mass (180) shown an increase in its molecular mass to 348 after treatment with acetyl chloride. The number of possible -NH_(2) groups in the molecule is

Answer»

5
4
3
6

Solution :The chemical reaction INVOLVED is as follows :
`-NH_(2)+Cl-OVERSET(O)overset("||")(C)-CH_(3) underset(+CH_(3)CO)overset(-H)(rarr)-NH-overset(O)overset("||")(C)-CH_(3)`
NET INCREASE in mol. mass on acylation of one `-NH_(2)` GROUP = Mol. mass of `CH_(3)CO` group.
-At. mass of H
`=43-1=42`
Actual increase in mol. mass on acylation
`=348-180=168`
No. of group `CH_(3)-overset(O)overset("||")(C)-` added `=168//42=4`
the compound has `4-NH_(2)` groups.


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