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Identify (A) to (C ):...

Identify (A) to (C ):

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D.U. in `A=((2n_(C)+2)-n_(H))/(2)=(18-8)/(2)=5^(@)` [4 D.U. for benzene + 1 d.U. for (CHO) group].
i. Compound (A) is in aliphatic aldehyde with benzene ring.
ii. Brady's reagent (2,4-DNP) test suggests the presence of `(C=O)` group.
iii. Benedict,s test suggests aliphatics aldehyde, since Fehling's and Benedict's solutions do not oxidise aromatic aldehyde.
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