MolSynapsequestion bank
MolSynapse / Question bank / Amines and Aromatic Nitrogen Compounds / Coupling reactions and azo dyes
JEE Main levelSingle correct optionDifficulty 2 of 3nc079

Methyl orange is prepared by diazotising X and coupling the diazonium salt with Y in mildly acidic medium. X and Y are

  1. AX = aniline, Y = N,N-dimethylaniline
  2. BX = sulfanilic acid (4-aminobenzenesulfonic acid), Y = N,N-dimethylaniline
  3. CX = sulfanilic acid (4-aminobenzenesulfonic acid), Y = phenol
  4. DX = 4-nitroaniline, Y = 2-naphthol

Answer: B

Methyl orange is sodium 4-[(4-dimethylamino)phenylazo]benzenesulfonate. The sulfonate-bearing ring comes from diazotised sulfanilic acid and the dimethylaminophenyl ring from N,N-dimethylaniline. Aniline in place of sulfanilic acid would lack the sulfonate group.
Practice Amines and Aromatic Nitrogen Compounds More on Coupling reactions and azo dyes
Previous questionNext question

More questions on Coupling reactions and azo dyes