Question

what is the name of the functional group that is attached to this hydrocarbon backbone? ether alcohol alkyl halide carbonyl group

Explanation:

An ether has an oxygen - carbon - carbon structure ($R - O - R'$). An alcohol has a hydroxyl group ($ - OH$) attached to a carbon. A carbonyl group has a carbon - oxygen double bond ($C=O$). In the given structure, halogen (chlorine) atoms are attached to the carbon atoms of the hydrocarbon backbone. Alkyl halides are compounds where a halogen atom is bonded to an alkyl group.

Answer:

C. alkyl halide