Step 1: Understanding the Concept
A benzylic halide has the halogen on the \(sp^{3}\) carbon attached to the benzene ring.
Step 2: Check Each Option
Chlorophenylmethane: \(\text{C}_6\text{H}_5\text{CH}_2\text{Cl}\), benzylic.
1-Chloro-1-phenylethane: Cl on the carbon next to the ring, benzylic.
2-Chloro-2-phenylpropane: Cl on the carbon attached to the ring, benzylic.
1-Chloro-2-phenylbutane: Cl on C1 while the phenyl is on C2, so Cl is not on the carbon bearing the ring.
Step 3: Compare the options
Option (D) is not benzylic.
Final Answer:
1-Chloro-2-phenylbutane is not a benzylic halide.
\[ \boxed{\text{(D) }\text{1-Chloro-2-phenylbutane}} \]