C₂H₅CHO and CH₃COCH₃ can be distinguished from one another by testing with

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Phenyl hydrazine

2, 4-Dinitrophenyl hydrazine

Fehling solution

Sodium bisulphite

answer is C.

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Detailed Solution

Fehling's A is a solution containing copper(II) sulphate, which is blue color. Fehling's B is a clear liquid consisting of potassium sodium tartrate (Rochelle salt) and a strong alkali like NaOH,KOH.,Etc, usually sodium hydroxide. During the test solutions A and B are prepared individually and stored. Just before the test they are mixed. Aldehyde give red ppt and ketones do not respond.

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