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JEE Main levelSingle correct optionDifficulty 2 of 3nc210

Methyl orange is prepared by coupling the diazonium salt of one compound with a second compound. These two compounds are

  1. Abenzenesulfonic acid and N,N-dimethylaniline
  2. Bsulfanilic acid (4-aminobenzenesulfonic acid) and N,N-dimethylaniline
  3. Caniline and phenol
  4. D4-nitroaniline and 2-naphthol

Answer: B

Diazotised sulfanilic acid couples at the para position of N,N-dimethylaniline in weakly acidic medium to give the sodium salt of 4-[4-(dimethylamino)phenylazo]benzenesulfonic acid, methyl orange.
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