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What is the name for red azo dye?

1. p-hydroxy azo benzene
2. \( \beta \) - nathyl azo benzene
3. p-amino azo benzene
4. p- \( \mathrm{N}, \mathrm{N} \) dimethyl amino azo benzene

Correct answer: p- \( \mathrm{N}, \mathrm{N} \) dimethyl amino azo benzene

Solution

p-N,N-dimethylamino azo benzene is the red azo dye because the dimethylamino group extends conjugation and shifts absorption into the visible red region. The other options correspond to different azo compounds with different colors or properties.

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