Final answer:
The compound that is a saturated hydrocarbon is CH3CH3 (option 2), also known as an alkane, which adheres to the general formula for saturated hydrocarbons, CnH2n+2.
Step-by-step explanation:
The compound that is a saturated hydrocarbon among the options provided is CH3CH3 (option 2). Saturated hydrocarbons are also known as alkanes, which contain only single bonds between carbon atoms and have the maximum number of hydrogen atoms possible as per the general formula CnH2n+2 (for non-cyclic structures). In contrast, options (1) CH2CH2 and (3) CH3CHO are not correct as they do not represent full chemical structures and (4) CH3CH2OH is an alcohol, not a hydrocarbon.
An example of a saturated hydrocarbon is C6H14, which indicates a chain of six carbon atoms with single bonds and fourteen hydrogen atoms.