A) acetylene
B) p-methoxy phenol
C) acetic acid
D) ethanol
Correct Answer: C
Solution :
Phenol shows more acidic character than alcohol and acetylene as its carbanion (phenoxide ion) is quite stable due to resonance. Its \[p{{K}_{a}}\] is \[\approx 9.0.\] But it is quite weaker acid than acetic acid \[(pKa\approx 4.0)\] as it has strong electron-withdrawing\[>C=O\]group.
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