Q73 / 180 · AIIMS 2017 · Chemistry

Assertion : Phenol forms 2, 4, 6-tribromophenol on treatment with $\mathrm{Br}_2$ - water at $273 \mathrm{~K}$. Reason : Phenol is $o, p$ - directing group.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

Phenol forms 2, 4, 6 tribromophenol on treatment with $\mathrm{Br}_{2^{-}}$water. In phenols, the polarisation of bromine takes place even in the absence of Lewis acid.

Hence, the correct answer is option: 'B'.

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