Nitration of aniline in strong acidic medium also
gives m-nitroaniline because
(1) In spite of substituents nitro group always
goes to only m-position.
(2) In electrophilic substitution reactions amino
group is meta directive.
(3) In absence of substituents nitro group always
goes to m-position
(4) In acidic (strong) medium aniline is present as
anilinium ion.