Answer
Straight-chain hydrocarbons: Hydrocarbons which are unbranched containing C-C and C-H bonds.
Ex: n-hexane, n-butane, 1-butene, 1-butyne etc.,
branched-chain hydrocarbons: They are hydrocarbons where C-C bonds are branched.
Ex: 2-methylpropane, 4-ethylbut-2-ene, 3-methylpent-1-yne
Work Step by Step
The structures of some of the straight-chain and branched hydrocarbons, each under alkanes, alkenes and alkynes is given in the attachment;