Although NH2 is ortho & para directing ,nitration of aniline gives meta nitro aniline.

 in aniline the NH2  group is basic in nature.when in reacts in the presence of acid, the aniline gets protonated. A -NH3+ group is deactivating and meta-directing when it comes to aromatic electrophillic substitutions, thus yielding m-nitroaniline.

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nitration is carried out in an acidic medium (a mixture of HNO3 and conc. H2SO4 ). In the acidic medium aniline is promoted to give anilinium ion which is meta promoting.
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