Which of the following is a natural dye?

Alizarin

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Malachite green

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Phenolphthalein

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Martius yellow

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Solution

The correct option is A Alizarin
Alizarin is a natural dye. Malachite green, phenolphthalein and martius yellow are synthetic dyes (man made dyes).
Alizarin or 1,2-dihydroxyanthraquinone is a red dye with molecular formula $C_{14} H_{8} O_{4}$ .

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Which of the following is a natural dye?

The correct option is A Alizarin Alizarin is a natural dye. Malachite green, phenolphthalein and martius yellow are synthetic dyes (man made dyes). Alizarin or 1,2-dihydroxyanthraquinone is a red dye with molecular formula C14H8O4.

The correct option is A Alizarin
Alizarin is a natural dye. Malachite green, phenolphthalein and martius yellow are synthetic dyes (man made dyes).
Alizarin or 1,2-dihydroxyanthraquinone is a red dye with molecular formula $C_{14} H_{8} O_{4}$ .