The correct answer is: A. Alkine: CnH2n – 2, Alkyne: CnH2n, Alkane: CnH2n + 2
An alkane is a hydrocarbon that contains only carbon and hydrogen atoms and is saturated, meaning that it has all of its carbon atoms bonded to the maximum number of hydrogen atoms possible. The general formula for an alkane is CnH2n+2, where n is the number of carbon atoms in the molecule.
An alkene is a hydrocarbon that contains at least one double bond between carbon atoms. The general formula for an alkene is CnH2n, where n is the number of carbon atoms in the molecule.
An alkyne is a hydrocarbon that contains at least one triple bond between carbon atoms. The general formula for an alkyne is CnH2n-2, where n is the number of carbon atoms in the molecule.
Therefore, the correct match is:
- Alkine: CnH2n – 2
- Alkyne: CnH2n
- Alkane: CnH2n + 2
Here is a table that summarizes the general formulas for alkanes, alkenes, and alkynes:
| Hydrocarbon | General formula |
|—|—|
| Alkane | CnH2n+2 |
| Alkene | CnH2n |
| Alkyne | CnH2n-2 |