Multiple choice

Which of the following is obtained from the root of the madder plant?

  1. Quinizarin

  2. Hydroxyanthraquinone

  3. Trihydroxyanthraquinone

  4. Disperse Red 11
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A Correct answer
Explanation

Quinizarin is an orange or red-brown crystalline powder. It is formally derived from anthraquinone by replacement of two hydrogen atoms by hydroxyl (OH) groups. It is one of ten dihydroxyanthraquinone isomers and occurs in small amounts (as a glycoside) in the root of the madder plant, Rubia tinctorum.

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