Give one reason each for the following :  

(i) Acetone reacts with hydroxylamine to form only one product which has no geometrical isomer, but acetaldehyde reacts with hydroxylamine to form a product which has two geometrical isomers.

(ii) Direct nitration of aniline is not possible.

i) 


For oximes to exhibit geometrical isomerism two groups attached to carbon atoms should be different since in acetoxime both groups are same (CH₃), it does not show geometrical isomerism. In the case of acetaldoxime, two different groups (CH₃ and H) are attached to a carbon atom, so it shows geometrical isomerism.