The correct answer is $\boxed{\text{A}}$. There are 6 isomers of C6H14.
An isomer is a molecule with the same molecular formula but a different structural formula. The isomers of C6H14 are:
- n-hexane
- 2-methylpentane
- 3-methylpentane
- 2,2-dimethylbutane
- 2,3-dimethylbutane
- 2,4-dimethylbutane
The first isomer, n-hexane, is the most common and has a straight chain of carbon atoms. The other isomers have branched chains of carbon atoms.
The isomers of C6H14 have different physical properties. For example, n-hexane has a boiling point of 68.7 degrees Celsius, while 2-methylpentane has a boiling point of 68.2 degrees Celsius. The isomers also have different chemical properties. For example, n-hexane is a nonpolar solvent, while 2-methylpentane is a polar solvent.
The isomers of C6H14 are important in chemistry and industry. They are used as solvents, fuels, and in the production of other chemicals.