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 isA. 5B. 4C. 3D. 6

Answer» Correct Answer - B
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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