Question

The allylic halide, among the following is _______.

• A.
• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is D

An allylic halide is an organic compound in which the halogen atom (X) is attached to a carbon atom that is adjacent to a carbon–carbon double bond (C=C).

The general formula of an allylic halide is: \[ CH_2=CH–CH_2–X \] where the –CH₂–X group is attached to the carbon next to the double bond.

Let's analyze each option:

• (A) R–CH(X)–R → Halogen is on a saturated carbon (no double bond nearby); not allylic.
• (B) CH₂=CH–X → Halogen is directly bonded to a double-bonded carbon; this is a vinylic halide.
• (C) C₆H₅–X → Halogen is attached to an aromatic ring carbon; this is an aryl halide.
• (D) CH₂=CH–CH₂–X → Halogen is on the carbon adjacent to C=C; this is an allylic halide.

Therefore, the correct answer is: \[ \boxed{CH_2=CH–CH_2–X} \]