Methyl red is a common azo dye. Which starting materials are used to prepare it?

1. Diazonium salt

2. Coupling component

Explanation:

Azo dyes re synthesized by the combination of two organic compounds viz

1. Diazonium salt

2. Coupling component

1) For methyl red, the diazonium salt which is an intermediate product is produced by  the reaction of hydrochloric acid (HCL) with anthranilic acid and sodium nitrate (NaNO₂)

2) The produced diazonium salt is then combined with dimethylaniline which is a coupling component rich in electrons to undergo a chemical reaction  that by an aromatic substitution mechanism to produce methyl red as the final product.

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