The chloroethane fit in the definition of a substituted hydrocarbon because chlorine atom is attached by replacing a hydrogen atom.
What is hydrocarbons?
Hydrocarbons are those organic compouds which are composed of hydrogen atoms and carbon atoms as well.
If in any compound additional group is present in the simple long chain of hydrocarbon then that compound will known as substituted hydrocarbon. Molecular formula of chloroethane is C₂H₅Cl and from this formula it is clear that chlorine atom is substitued in place of one hydrogen atom of ethane and its structure is shown in the attached image.
Hence chloroethane fits is the substituted hydrocarbon due to presence of chlorine atom.
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