Answer:
Cannizzaro reaction:
Those aldehydes which do not have a-hydrogen undergo self oxidation and
reduction in the presence of concentrated alkali to give salt of carboxylic acid
and alcohol.
(ii) Rosenmund's
reduction : Acyi chloride is hydrogenated by palladium and barium sulphate
to gives aldehyde.
(iii) Wolff
Kishner reduction : Carbonyl compounds on treatment with hydrazine give
hydrazone which on reaction with KOH and ethylene glycol give alkanes.
(iv) AIdol condensation
: Aldehydes and ketones having at least one 
hydrogen
undergo a reaction in the presence of dilute alkali as catalyst to form (
hydroxy aldehyde, (aldol) or (hydroxy ketones.
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