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7. Alcohol, phenol and ethers — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry7. Alcohol, phenol and ethers1 Mark
MCQ
Assertion : Phenol is a strong acid than ethanol.
Reason : Groups with $+M$ effect decreases acidity at $p-$ position
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • ✓
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: B.
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
b
Phenol is strong acid than ethanol because phenoxide ion is resonance stabilised. When a group having $+M$ effect is at $ p-$ position (like halide group) it decreases the acidity of phenols. So assertion and reason are correct but reason is not the explanation of assertion. So correct option is $(b)$.

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