which Aniline on acetylation gives
It might be possible that you have missed some part of the question. Because after the word GIVES you haven't mentioned any compound, so that I can tell which anniline it would be.
Now second possibility that you are asking that - what aniline on acetylation gives ?
So, considering the second possibility, here is my answer :-
Acetylation of anniline gives acetanilide , which undergoes nitration at low temperature, yielding the para-nitro product in high yield.
Also note that - Acetylation of aniline reduces its activation effect, because of resonance the lone pair of electrons on nitrogen of acetanilide gets delocalised towards carbonyl group.