Among the given compounds which of the following is vinylic halides:

Options

A. `CH_3 CH = CHCH_2 Br `
B.
C.
D. `CH_3underset(CH_3)underset(|)CH CH - CH_2`

Explanation

To determine which of the given compounds is a vinylic halide, we first need to understand what a vinylic halide is. A vinylic halide is a compound where a halogen atom (like Cl, Br, I, or F) is attached to a carbon atom that is part of a double bond (alkene). Specifically, the carbon atom that is bonded to the halogen must be sp² hybridized, meaning it is bonded to two other atoms and has a double bond with another carbon atom.

### Step-by-Step Solution:

1. **Identify the Definition of Vinylic Halides:**
- A vinylic halide is characterized by the presence of a halogen atom attached to a carbon that is part of a double bond (sp² hybridized).

2. **Analyze Each Compound:**
- We will examine each option to see if it fits the definition of a vinylic halide.

3. **Option 1: CH₃CH=CH₂Br**
- The halide (Br) is attached to the terminal carbon (CH₂) which is sp³ hybridized (single bond). The adjacent carbon (CH) is part of the double bond but does not have the halide attached. **This is NOT a vinylic halide.**

4. **Option 2: CH₃C(Br)=CH₂**
- The halide (Br) is attached to the carbon that is part of the double bond (C=CH₂). The carbon with Br is sp² hybridized. **This is a vinylic halide.**

5. **Option 3: CH₂=CHBr**
- The halide (Br) is attached to the sp² hybridized carbon that is part of the double bond. **This is a vinylic halide.**

6. **Option 4: CH₂=CH₂**
- There is no halide present in this compound. **This is NOT a vinylic halide.**

7. **Conclusion:**
- The correct answer is **Option 3: CH₂=CHBr**, as it is the only compound where the halogen is attached to a carbon that is part of a double bond.