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JEE Main · 2010 · 11 Apr 2010 · Offline · Compounds Containing Nitrogen

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In the chemical reactions,

the compounds ' A ' and ' B ' respectively are
  1. (A)nitrobenzene and fluorobenzene
  2. (B)phenol and benzene
  3. (C)benzene diazonium chloride and fluorobenzene✓ Correct
  4. (D)nitrobenzene and chlorobenzene

Answer: (C)

Solution

Aniline treated with sodium nitrite and hydrochloric acid at to K is diazotised to benzene diazonium chloride, which is compound A. Warming the diazonium salt with fluoroboric acid, the Balz-Schiemann reaction, replaces the diazonium group by fluorine to give fluorobenzene, which is compound B. So A is benzene diazonium chloride and B is fluorobenzene.

JEE Main · 2010 · 11 Apr 2010 · Offline · Single correct option

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