Question

A straight chained hydrocarbon with this formula C5H10

Answer 1

Yea... what about it?

Answer 2

A straight chained hydrocarbon with this formula C5H10 has a double paired C-C bond

Answer 3

Any straight chained hydrocarbon with the general formula \( \color{green}{\text{C}_n\text{H}_{2n}} \) is an alkene. You can't say which alkene \( \color{green}{\text{C}_5\text{H}_{10}} \) is, because you do not know the location of the double bond, unless you are given some more information.