(e) Addition of ammonia and its derivatives:  Nucleophiles, such
as ammonia and its derivatives H2N-Z add to the carbonyl
group of aldehydes and ketones The reaction is reversible
and catalysed by acid The 
equilibrium
favours the product
formation due to rapid
dehydration of the
intermediate to form
>C=N-Z Z = Alkyl, aryl, OH, NH2, C6H5NH, NHCONH2, etc