In the following reaction, X is:
Hydrocarbons · Class 11 · JEE Main Previous Year Question
In the following reaction, X is:
- a✓
- b
- c
- d
Step 1: Identify the Reaction
Benzene + isobutylene () with HF catalyst = Friedel-Crafts alkylation.
HF protonates isobutylene: (tertiary carbocation, Markovnikov)
Step 2: Electrophilic Attack on Benzene
Key Points:
- HF is a superacid catalyst for FC alkylation with alkenes
- Markovnikov addition gives tertiary carbocation from isobutylene
- Major product = tert-butylbenzene (one alkyl group added)
- The group goes para to itself in further reactions (steric control)
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