Certain nitrogeneous compound with molecular mass (180) shown an increase in its molecular mass to 348 after treatment with acetyl chloride. The numbe
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
A. 5
B. 4
C. 3
D. 6
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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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