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Q.

Which of the following aldehydes give red precipitate with Fehling solution.

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a

Benzaldehyde

b

p-Salicylaldehyde

c

Acetaldehyde 

d

formaldehyde

answer is C.

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Detailed Solution

Fehling solution is formed when sodium tartrate added to copper sulphate solution. Only aliphatic aldehydes gives Fehling solution by the formation of red precipitate of Cu2O. Among the given options, only acetaldehyde is an aliphatic aldehyde that gives Fehling solution test.

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Which of the following aldehydes give red precipitate with Fehling solution.