Nitration of aniline in strong acidic medium also gives m-nitroaniline because
In absence of substituents nitro group always goes to m-position.
In electrophilic substitution reactions amino group is meta directive.
In spite of substituents nitro group always goes to only m-position.
In acidic (strong) medium aniline is present as anilinium ion.
As we learnt that
Reaction of Aniline with dil. HNO3 -
With dil. HNO3 meta product is also formed in large amount because HN2 group is protonated and it becomes P - directing.
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Option 1)
In absence of substituents nitro group always goes to m-position.
This is incorrect.
Option 2)
In electrophilic substitution reactions amino group is meta directive.
This is incorrect.
Option 3)
In spite of substituents nitro group always goes to only m-position.
This is incorrect.
Option 4)
In acidic (strong) medium aniline is present as anilinium ion.
This is correct.