Step 1. Understanding Vinyl Halide: Vinyl halides are compounds in which a halogen atom is directly attached to an sp2 hybridized aliphatic carbon atom, which forms part of a double bond.
Step 2. Examine Each Structure: Option (1): Contains a halogen attached to an sp2 hybridized carbon in a double-bonded system, classifying it as a vinyl halide. Option (2): Represents an allyl halide, with the halogen attached to an sp3 hybridized carbon adjacent to a double bond. Options (3) and (4): Both structures are aryl halides, with the halogen attached to an aromatic ring.
Step 3. Conclusion: Option (1) is the correct example of a vinyl halide.
\( \text{M} \xrightarrow{\text{CH}_3\text{MgBr}} \text{N} + \text{CH}_4 \uparrow \xrightarrow{\text{H}^+} \text{CH}_3\text{COCH}_2\text{COCH}_3 \)