Multiple choice

Which of the following is the chemical name of methyl orange?

  1. Para-animoazobenzene

  2. Para-hydroxoazobenzene

  3. Phenyl isothiocyanate

  4. Sodium-4-[(4-dimethylamino)phenylazo] benzene sulphonate

  5. N-phenyl benzene sulphonamide
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D Correct answer
Explanation

This option is correct because diasotised sulphanilic acid undergoes coupling reaction with N-N dimethyl aniline to give methyl orange. The methyl orange acts as the acid based titration. The chemical name of methyl orange is sodium 4-[(4-dimethylamino)phenylazo]benzene sulphonate.

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