Question

what will be the result when we will go for nitration of 4-chloroaniline

Answer 1

2-nitro-4-chloroaniline because NH3 is a stronger actiavtor of the benzene ring then Cl and because NO2 is a ortho/para director and the ortho position is taken up it will go ortho to NH3 thus forming your product.

Answer 2

but sir, as i know in the presence of acid the amino group of aromatic ring will from anilinium ion which is meta director.....so what will happen in that case?