JEE Main Chemistry question
How many of the following compounds can be categorised as allylic halides?
3-Chloropropene, 3-bromocyclohexene, benzyl chloride, 4-iodopent-2-ene, bromobenzene, (1-chloroethyl)benzene, 4-chlorocyclopentene, 1-chlorobut-1-ene, 1-chlorobut-2-ene
Answer: 4
Solution
An allylic halide has its halogen on an carbon directly adjacent to a carbon–carbon double bond. Checking each: 3-chloropropene (CH_2=CH-CH_2Cl) — allylic; 3-bromocyclohexene (Br adjacent to the ring double bond) — allylic; benzyl chloride — benzylic, not allylic (no alkene); 4-iodopent-2-ene
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