Solution:

(c) Hydrocarbons. A hydrocarbon is an organic molecule made completely of hydrogen and carbon in organic chemistry. Hydrocarbons are an example of hydrides in group 14. Hydrocarbons are colourless, hydrophobic, and have only a faint odour. It’s impossible to generalise further due to their different molecular configurations.

(d) Alkene. A hydrocarbon with a carbon-carbon double bond is known as an alkene. Alkene is frequently used interchangeably with olefin, which refers to any hydrocarbon with one or more double bonds. There are two forms of monoalkenes: terminal and internal monoalkenes.