Answer
Option C - Heptyne
Explanation
The longest chain of atoms in a particular molecule consists of seven carbon atoms. This molecule might be called heptane (C7H16). It can be a straight chain or can be branched. Its structure is -C-C-C-C-C-C-C-. Carbon completes its four bonds by combining hydrogen atoms. Hydrocarbons are named according to the carbon atoms. One carbon atom is methane, two containing is ethane, three is propane, four is butane, five is pentane, six is hexane, seven is heptane, eight is octane, nine is nonane and ten is decane.
