Question

Convert ethanoyl chloride into ethanal

Answer 1

Treat the amine, ethyl amine with NaNO2+HCl. This will convert the amino group into a diazonium group, which is an extremely good leaving group.On hydrolysis of the diazonium compound with an aqueous solvent, the amino group will be replaced by an alcoholic (-OH) group, therefore you will get your ethanol.

Answer 2

Ethanoyl chloride on a reaction with H2/pd gives ethanal