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Which reaction is used to prepare alkyl halides from alcohols using SOCl₂?
- Friedel-Crafts
- Sandmeyer
- Darzens
- Appel
Answer: Appel
Appel reaction: R-OH + SOCl₂/PPh₃ → R-Cl + SO₂ + POCl₃. Converts alcohols to alkyl chlorides under mild conditions. Important synthetic method in organic chemistry. [[NCERT Chemistry Class 12]]