Answer: the best option to answer the question is the second one (letter B).
Step-by-step explanation:
The question requires us to choose, among the options given, which one best describes a hydrocarbon that contains a C to C double bond.
We can give the following definitions to the options provided by the question:
- Saturated: a saturated hydrocarbon presents all C to C bonds as single bonds;
- Unsaturated: an unsaturated hydrocarbon presents at least one C to C double (or triple) bond;
- Alkane: an alkane can be defined as an open chain hydrocarbon that contains only single C to C bonds;
- Alcohol: in chemistry, an alcohol is defined as a moelcule that contains at least one hydroxyl (-OH) attatched to a carbon atom of a hydrocarbon chain.
Considering the definitions above, we can say that an unsaturated hydrocarbon best describes a hydrocarbon that contains a C to C double bond. Therefore, the best option to answer the question is the second one (letter B).