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Assertion $(A): 4-$nitrophenol is more acidic than $2, 4, 6-$trinitrophenol.
Reason $(R): $ Phenol is a weaker acid than carbonic acid.

• A
  Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
• B
  Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
• C
  $A$ is true but $R$ is false.
• ✓
  $A$ is false but $R$ is true.