Aldehydes
and ketones are reduced to alcohols with NaBH4, LiAlH4, or by catalytic hydrogenation The carbonyl group of aldehydes and ketones can be reduced to a methylene group
by Clemmensen reduction or Wolff-Kishner reduction Aldehydes are easily
oxidised to carboxylic acids by mild oxidising reagents such as Tollens’ reagent and
Fehling’s reagent These oxidation reactions are used to distinguish aldehydes from
ketones