For the given reaction: What is A (major product)?
Hydrocarbons · Class 11 · JEE Main Previous Year Question
For the given reaction:
What is A (major product)?
- a
- b✓
- c
- d
Step 1: NaNH2 -- Dehydrohalogenation is a strong base. It eliminates HBr:
Step 2: Red Hot Iron Tube at 873 K -- Trimerization
Trimerization of 2-butyne over red hot Fe tube gives 1,3,5-trimethylbenzene.
Key Points:
- NaNH2: strong base for dehydrohalogenation of vinyl/propargyl halides
- Fe tube at 873 K: cyclotrimerization of alkynes to aromatic compounds
- 2-butyne trimerizes to 1,3,5-trimethylbenzene (mesitylene)
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