JEE MainChemistryAlcohols Phenols and EthersMCQ+4 / −1
Given below are two statement : Statements I : Bromination of phenol in solvent with low polarity such as or requires Lewis acid catalyst. Statements II : The Lewis acid catalyst polarises the bromine to generate . In the light of the above statements, choose the correct answer from the options given below :
- AStatement I is true but Statement II is false
- BBoth Statement I and Statement II are true
- CStatement I is false but Statement II is true
- DBoth Statement I and Statement II are false
View written solutionFree
Correct answer: C
- Understand Statement I
Phenol is a strongly activating aromatic compound because the group donates electron density to the benzene ring by resonance.
So, phenol undergoes electrophilic bromination very easily.
- In non-polar solvents like or , bromination of phenol gives mainly ortho- and para-bromophenol.
- Because the ring is already strongly activated, Lewis acid catalyst is not required.
Therefore, Statement I is false.
- Understand Statement II
A Lewis acid such as can polarize :
More precisely, the Lewis acid makes bromine sufficiently electrophilic, often described in electrophilic substitution as generation of (or a bromonium-like electrophile).
Thus, the statement that Lewis acid catalyst polarises bromine to generate is conceptually true.
Therefore, Statement II is true.
- Evaluate options
- A: Statement I true, Statement II false Incorrect
- B: Both true Incorrect
- C: Statement I false, Statement II true Correct
- D: Both false Incorrect
- Final Answer
The correct option is:
- Comparison with stored correct answer
Stored correct answer = C
Derived answer = C
So, the derived answer agrees with the stored correct answer.
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