Question:
Which one of the following is an allylic halide?
Which one of the following is an allylic halide?
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Allylic = adjacent to double bond, Vinylic = directly on double bond.
Updated On: May 8, 2026
- 2-chlorobutane
- Chloroethene
- 3-bromopropene
- 2-chlorotoluene
- Dichloromethane
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The Correct Option is C
Solution and Explanation
Concept:
An allylic halide is one in which the halogen atom is attached to a carbon atom adjacent to a carbon-carbon double bond.
Step 1: Define allylic position. \[ \text{Allylic position: } CH_2=CH-CH_2-X \]
Step 2: Check options.
• (A) No double bond → not allylic
• (B) Halogen directly on double bond → vinylic, not allylic
• (C) \(CH_2=CH-CH_2Br\) → halogen adjacent to double bond → correct
• (D) Aromatic substitution → not allylic
• (E) No double bond → not allylic Final conclusion: \[ \boxed{\text{3-bromopropene is allylic halide}} \]
Step 1: Define allylic position. \[ \text{Allylic position: } CH_2=CH-CH_2-X \]
Step 2: Check options.
• (A) No double bond → not allylic
• (B) Halogen directly on double bond → vinylic, not allylic
• (C) \(CH_2=CH-CH_2Br\) → halogen adjacent to double bond → correct
• (D) Aromatic substitution → not allylic
• (E) No double bond → not allylic Final conclusion: \[ \boxed{\text{3-bromopropene is allylic halide}} \]
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