Given below are two statements: Statement-I: Nitration of benzene involves the following step: Statement-II: Use of…
Hydrocarbons · Class 11 · JEE Main Previous Year Question
Given below are two statements:
Statement-I: Nitration of benzene involves the following step:
Statement-II: Use of Lewis base promotes the electrophilic substitution of benzene.
In the light of the above statements, choose the most appropriate answer from the options given below:
- a
Both Statement-I and Statement-II are incorrect
- b✓
Statement-I is correct but Statement-II is incorrect
- c
Both Statement-I and Statement-II are correct
- d
Statement-I is incorrect but Statement-II is correct
Statement-I is correct but Statement-II is incorrect
Step 1: Evaluate Statement-I
Nitration of benzene involves formation of nitronium ion :
This is the correct mechanism for nitronium ion formation. Statement-I is CORRECT.
Step 2: Evaluate Statement-II
Electrophilic aromatic substitution (EAS) is promoted by a Lewis ACID (like , , ), NOT a Lewis base. Lewis acids generate the electrophile.
Lewis BASE would donate electrons, not generate electrophile. Statement-II is INCORRECT.
Key Points:
- Nitronium ion is the active electrophile in nitration
- acts as an acid to protonate , generating
- EAS requires Lewis ACID catalyst (e.g., ), not Lewis base
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