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A compound (X) with a molecualr formula ...

A compound (X) with a molecualr formula `C_(5)H_(10)O` gives a positive 2, 4-DNP test but a negative Tollens' test. On oxidation it gives a carboxylic acid (Y) with a molecular formula `C_(3)H_(6)O_(2)`. Potassium salt of (Y) undergoes Kolbe's reaction and gives a hydrocarbon (Z). (X), (Y) and (Z) respectively are

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As the compound `A(C_(5)H_(10)O)` gave a positive `2, 4 - D.N.P.` test, in must be carbonyl compound i.e., aldehyde or ketone, Since it gave a negative Tollen's test, it must be a ketone and not an aldehyde. Since ketone upon oxidation reactions may be shows as follows :

The sodium salt of the acid B when subjected to Kolbe's reactions gives hydrocarbon which is butane `[C]` as given in the equations
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