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Benzenediazonium chloride couples with phenol in mildly alkaline medium (pH 9-10) to give

  1. A4-hydroxyazobenzene (p-hydroxyazobenzene)
  2. Bazoxybenzene
  3. C4-aminoazobenzene
  4. D2,4,6-tribromophenol

Answer: A

Coupling is an electrophilic substitution by the diazonium ion on the phenoxide ion, at the para position, forming the orange azo compound 4-hydroxyazobenzene.
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