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Give one chemical test to distinguish between the following pairs of compounds :
Acetaldehyde and benzaldehyde

Text Solution

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When acetaldehyde is heated with Fehling.s solution, red precipitate of cuprous oxide is formed.
`underset("Acetaldehyde")(CH_(3)CHO)+undersetunderset("solution")("Fehling.s")underset(darr)(2CuO)rarrunderset(("Red ppt."))(Cu_(2)O(s)darr)+CH_(3)COOH`
On the other hand, benzaldehyde does not give red precipitate with Fehling.s solution.
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