Functional Groups A given functional group Double behaves in nearly the bond CH3 same way in every =0 molecule it is a part of H2C-CH The chemistry of every C-CHa organic molecule, regardless of size and Ethylene Menthene complexity,is determined by the functional groups. -Bromine added here In the reactions ofethylene and menthene with bromine both molecules react with Br2 in the C-CH3 same way Functional Groups A given functional group behaves in nearly the same way in every molecule it is a part of The chemistry of every organic molecule, regardless of size and complexity, is determined by the functional groups. In the reactions of ethylene and menthene with bromine both molecules react with Br2 in the same way