Answer
Please see the work below.
Work Step by Step
The compounds along with their molecular and structural formula are given as under
Methane $CH_4$ as $CH_4$
Ethane $C_2H_6$ as $CH_3CH_3$
Propane $C_3H_8$ as $CH_3CH_2CH_3$
Butane $C_4H_{10}$ as $CH_3CH_2CH_2CH_3$
Pentane $C_5H_{12}$ as $CH_3CH_2CH_2CH_2CH_3$
