The alkyl group(s) present in the given compound is/are
Methyl
Ethyl
A hydrocarbon becomes a reactive group when a hydrogen atom is replaced from it. This reactive group is known as radicals. Radicals are represented by 'R'.
Therefore, radicals present in the given compound are methyl and ethyl radicals. The IUPAC name of the given compound is 3- Methyl, 4- ethyl heptane.