Asked in PMC Practice Test 33 (2021) 2021Moderate

The solution of phenol in water has a pH of about?

Correct answer: D. 5-6

  • A. 4-5
  • B. 3-5
  • C. 2-4
  • D. 5-6

Explanation

The solution of phenol in water has a pH of about 5-6 ( depending upon its concentration ). That means that a very dilute solution isn't acidic enough to turn litmus paper fully red. Litmus paper is blue at pH 8 and red at pH 5. The rest options have incorrect pH values.

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About Phenols

Phenols contain a hydroxyl group directly bonded to an aromatic ring, making them more acidic than alcohols because the phenoxide ion is resonance-stabilised. Reactions include ionisation with bases, electrophilic substitution, bromination, nitration and oxidation, with attention to the difference between phenols and aliphatic alcohols.

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