Multiple choice

Which one of the following is an example of an azo dye?

  1. Alizarin

  2. Methyl orange

  3. Indigo

  4. Martius yellow
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B Correct answer
Explanation

Azo dyes contain one or more azo groups (-N=N-) as the chromophore. Methyl orange (sodium 4-[(4-dimethylamino)phenylazo]benzenesulfonate) contains a characteristic azo linkage between aromatic rings, making it a classic example of an azo dye used as a pH indicator. Alizarin is an anthraquinone dye, Indigo is a vat dye, and Martius yellow is an azo dye but less commonly cited as the example.

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