Benzenediazonium chloride is added to an alkaline solution of each of the following compounds. Which one gives an orange-red azo dye?

Aphenol
Bbenzyl alcohol
Cethoxyethane
Dcyclohexanol

Answer: A

The phenoxide ion is an activated aromatic ring which couples with the diazonium ion at the para position, giving 4-hydroxyazobenzene. Alcohols and ethers do not have an activated aromatic ring and do not couple.

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