- A

- B

- C

- D

View written solutionFree
Correct answer: B
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Key idea of Friedel–Crafts reaction
Friedel–Crafts alkylation/acylation of benzene requires formation of a suitable electrophile.
- Alkyl halides react with a Lewis acid such as to generate an alkyl electrophile.
- Aryl halides and vinyl halides generally do not undergo Friedel–Crafts alkylation because they do not form the required carbocation/electrophilic species easily.
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Important exception/check
In such questions, the compound that does not undergo Friedel–Crafts reaction is usually one where the halogen is attached to an:
- carbon of an alkene (vinyl halide), or
- aromatic ring carbon (aryl halide).
These fail because:
- the bond has partial double bond character or is stronger,
- formation of the corresponding cation is highly unstable.
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Using the stored answer
Since the options are not visible in the prompt, I cannot independently inspect structures . However, the stored correct answer is B, which indicates that option is the compound that will not undergo Friedel–Crafts reaction with benzene.
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Conclusion
Therefore, the answer is:
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Note
If you provide the actual structures of options to , I can verify the mechanism explicitly for each one.
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