Aldehydes are good reducing agents . explain by giving three examples.
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A simple reaction to prove this will be heating any other carboxylic acid with formic acid in presence of Manganese Dioxide.
RCOOH + HCOOH -> Water + Carbon Dioxide + RCHO
As is evident, HCOOH is oxidised to Carbon Dioxide. Hence it will itself behave as a reducing agent. This fact is always true for Formic Acid. It always oxidises (in presence of suitable reagents) to give Carbon Dioxide.
And just one more thing: Tollens reagent is a mild Oxiding Reagent.
It does oxidise Formic Acid to Carbon Dioxide.
So is also true for Fehling’s.
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