Final answer:
The structural formulas for the given hydrocarbons are: methane (CH4), ethane (C2H6), ethene (C2H4), and ethyne (C2H2). The structural formula shows the arrangement of atoms and the bonds between them.
Step-by-step explanation:
The structural formulas for the given hydrocarbons are as follows:
(a) Methane (CH4): H - C - H
(b) Ethane (C2H6): H - C - C - H
(c) Ethene (C2H4): H2C = CH2
(d) Ethyne (C2H2): HC ≡ CH
The structural formula shows the arrangement of atoms and the bonds between them. In methane (CH4), there is a single carbon atom bonded to four hydrogen atoms. In ethane (C2H6), there are two carbon atoms bonded to six hydrogen atoms. In ethene (C2H4), there are two carbon atoms double-bonded to each other and each bonded to two hydrogen atoms. In ethyne (C2H2), there are two carbon atoms triple-bonded to each other and each bonded to one hydrogen atom.