Q13 / 150 · MHT CET 2026 (17 April Shift 1) · Chemistry
Which among the following is allylic halide?
- A$\text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \text{X}$
- B$\text{C}_6\text{H}_5 - \text{CH}_2 - \text{X}$
- Correct answerC$\text{CH}_2 = \text{CH} - \text{CH}_2 - \text{X}$
- D$\text{CH}_3 - \text{CH} = \text{CH} - \text{X}$
Solution
An allylic halide is a compound in which the halogen atom is bonded to an $sp^3$ hybridized carbon atom that is adjacent to a carbon-carbon double bond ($C=C$).
In $\text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \text{X}$, the halogen is attached to an $sp^3$ carbon of an alkane chain, making it an alkyl halide.
In $\text{C}_6\text{H}_5 - \text{CH}_2 - \text{X}$, the halogen is attached to an $sp^3$ carbon adjacent to a benzene ring, making it a benzylic halide.
In $\text{CH}_2 = \text{CH} - \text{CH}_2 - \text{X}$, the halogen is attached to an $sp^3$ hybridized carbon atom which is directly bonded to a carbon-carbon double bond. This is an allylic halide.
In $\text{CH}_3 - \text{CH} = \text{CH} - \text{X}$, the halogen is attached directly to an $sp^2$ hybridized carbon of a double bond, making it a vinylic halide.
Answer: $\text{CH}_2 = \text{CH} - \text{CH}_2 - \text{X}$
In $\text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \text{X}$, the halogen is attached to an $sp^3$ carbon of an alkane chain, making it an alkyl halide.
In $\text{C}_6\text{H}_5 - \text{CH}_2 - \text{X}$, the halogen is attached to an $sp^3$ carbon adjacent to a benzene ring, making it a benzylic halide.
In $\text{CH}_2 = \text{CH} - \text{CH}_2 - \text{X}$, the halogen is attached to an $sp^3$ hybridized carbon atom which is directly bonded to a carbon-carbon double bond. This is an allylic halide.
In $\text{CH}_3 - \text{CH} = \text{CH} - \text{X}$, the halogen is attached directly to an $sp^2$ hybridized carbon of a double bond, making it a vinylic halide.
Answer: $\text{CH}_2 = \text{CH} - \text{CH}_2 - \text{X}$
Hence, the correct answer is option: 'C'.