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The compound shown gives no effervescence with aqueous . Which of the structures shown does give with aqueous ?

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: D

Only a carboxylic acid is acidic enough ( about 4) to decompose bicarbonate. Phenol (A, about 10) does not; the alcohol B and the ester C are not acidic. Benzoic acid, D, gives effervescence.
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