Alkanes

The Hydrogens attached to a Carbon atom are said to be equivalent if they are in a same chemical environment. Same chemical environment means that under a reaction condition, these hydrogens would lose their identities of being attached to separate Carbons and behave like an identical set. 

A halogen derivative of an alkane is called a Haloalkane, where the hydrogen is replaced with a halogen.

The common or the trivial name is Alkyl Halide.