Methyl Group: A functional group consisting of a carbon atom bonded to three hydrogen atoms. The methyl group is represented by CH₃ in organic compounds like bromomethane.
Gas: A state of matter characterized by particles that are far apart from each other and move freely. Bromomethane exists as a gas at room temperature.
Functional Group: A specific arrangement of atoms within a molecule that gives it characteristic chemical properties. The methyl group in bromomethane is an example of a functional group.