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NEET levelSingle correct optionDifficulty 1 of 3g2115

Which of the following compounds gives brisk effervescence when added to aqueous sodium hydrogencarbonate?

  1. ABenzoic acid
  2. BPhenol
  3. CEthanol
  4. DAcetone

Answer: A

Effervescence of needs an acid stronger than ( 6.4). Benzoic acid (4.20) qualifies. Phenol (10.0), ethanol (15.9) and acetone (19.3) are all weaker acids than carbonic acid.
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