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  4. When aliphatic aldehyde heat with Fehling solution product formed is:

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Q. When aliphatic aldehyde heat with Fehling solution product formed is:

Rajasthan PMTRajasthan PMT 2002Aldehydes Ketones and Carboxylic Acids

Solution:

Aliphatic aldehyde on heating with Fehling solution produces red precipitate of $Cu _{2} O$.
$R- CHO +2 Cu ( OH )_{2}+ NaOH \longrightarrow RCOO ^{-}+ Na ^{+}+ \underset{\text{Red ppt}}{Cu _{2} O }+3 H _{2} O$