Question

what happens when aniline reacts with conc h2so4

Answer 1

Question:

what happens when aniline reacts with conc h2so4?

Answer:

◆ When aniline react with conc H2O.

Equation: C6H5NH2 + H2SO4 ----- C6H5NH3 + HSO4

◆ The anilinium ion, having a positive charge, is unlike aniline very slow to react with electrophiles llike SO3 or NO2+ to give sulfonic acid or nitro-compounds.

◆ So a mixture of H2SO4 and HNO3 will not nitrate aniline.

◆ For this reason to nitrate or sufonate aniline we convert it first to acetanilide C6H5NHCOCH3 which being virtually non-basic does not protonate completely in concentrated H2SO4.

◆ Also it is less reactive than aniline so less likely to oxidise or polysubstitute. Then the acetyl group is removed by base hydrolysis:

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