Explain the versatility of carbon in molecule formation by its electron configuration and the kinds and numbers of bonds carbon will form. Which of the following compounds would contain a double bond? a. CaHs b. C2H6 . H d. C2H4 e. C2H2 IDENTIFYING FUNCTIONAL GROUPS: Circle the functional group(s) and write the functional group name(s) on the first line. Then write the chemical formula on the second line. H R-C-OH C-C-N 1. H HO H-C-C 0-H H- 3. 4. 2.