For the identification of $\mathrm{\beta }$ -naphthol using dye test, it is necessary to use

• A

  Dichloromethane solution of $\mathrm{\beta }$ -naphthol.
• B

  Acidic solution of $\mathrm{\beta }$ -naphthol.
• C

  Neutral solution of $\mathrm{\beta }$ -naphthol.
• Correct answer
  D

  Alkaline solution of $\mathrm{\beta }$ -naphthol.

Hence, the correct answer is option: 'D'.