Ncert Exercises & Solutions

Assertion: Toluene on Friedel Crafts methylation gives o- and p- xylene.

Reason: $C H_{3}$ -group bonded to benzene ring increases electron density at o- and p- position.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.

2. Both assertion and reason are true and the reason is not the correct explanation of assertion.

3. Assertion is true but the reason is false.

4. Assertion is false but the reason is true.

Hint: CH₃ group is an electron-donating group

Toluene has -CH₃ group attached to benzene. -CH₃ group activates the benzene for the attack of an electrophile.

In the resonating structure of toluene, electronic density is more on ortho and para position.

Hence, substitution takes place mainly at these positions. Thus, both assertion and reason are true and the reason is the correct explanation of assertion.

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