Which of the following compounds is not classified as a halide hydrocarbon?

• A. ${\mathrm{CH}}_3\mathrm{Br}$ (methyl bromide)
• B. $C_6{H}_6$ (benzene)
• C. ${\mathrm{CH}}_{3}I$ (methyl iodide)
• D. $C_2{H}_5\mathrm{Cl}$ (ethyl chloride)

Answer: (B)

Verified step by step guidance

1. Understand the definition of a halide hydrocarbon (also called an alkyl halide): it is an organic compound where one or more hydrogen atoms in an alkane (saturated hydrocarbon) are replaced by halogen atoms (F, Cl, Br, I).
2. Examine each compound to determine if it fits this definition: check if the compound is an alkane derivative with halogen substituents.
3. For methyl bromide (CH\_3Br), methyl iodide (CH\_3I), and ethyl chloride (C\_2H\_5Cl), note that these are alkyl groups (methyl or ethyl) bonded to halogens, so they are halide hydrocarbons.
4. For benzene (C\_6H\_6), recognize that it is an aromatic hydrocarbon with a conjugated ring system and no halogen substituents; thus, it is not a halide hydrocarbon.
5. Conclude that benzene is the compound not classified as a halide hydrocarbon because it lacks halogen substitution on an alkane framework.