Which of the following is an example of a basic dye?

Alizarin

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Malachite

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Indigo

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Orange-1

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Solution

The correct option is D Malachite
All other dyes are natural dyes. Basic dyes are water soluble and are cationic and act as bases. Malachite green is an organic compound. Malachite green is prepared by condensation of benzaldehyde and dimethylaniline. Basic dyes display cationic functional groups like $- N R_{3}^{+}$ or $= N R_{2}^{+}$ .

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