Which of the following statements about unsaturated hydrocarbons is correct?
- A$\text{CH}_3\text{CH}_2\text{CH=CHCH}_3$ is an unsaturated hydrocarbon.
- BEthene has more hydrogen atoms per molecule than ethane.
- CUnsaturated hydrocarbons have double bonds between carbon and hydrogen atoms.
- DUnsaturated hydrocarbons turn aqueous bromine from colourless to brown.