When an alkane reacts with an element from group 7a, the reaction is referred to as?

Alkanes are saturated hydrocarbon, that is they contain hydrogen and carbon without a double or triple bond between the carbon atoms, e. g. ethane, propane. Group 7a in the periodic table are called halogens e. g chlorine, bromine. Alkanes react with halogens in a reaction called substitution, where halogens replace hydrogen atoms in alkanes.