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Assertion $(A):$ Aqueous solution of phenol is called as carbonic acid.
Reason $(R):$ Increasing order of acidity of phenols is m nitrophenol $ > o-$nitrophenol $ > p-$nitrophenol.

• 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.
• ✓
  Both $A$ and $R$ are false.