which of these structures represent 2-methylbutane? a molecule with the formula c h 3 c h c h 3. there is a c h 2 c h 3 group attached to the c h carbon. a molecule with the formula c h 3 c h c h 2. there is a c h 3 group attached to both the c h and c h 2 carbon. a molecule with the formula c h 3 c h 2 c h c h 3. there is a second c h 3 group attached to the c h carbon. a molecule with the formula c h 3 c h c h 2 c h 3. there is a second c h 3 group attached to the c h carbon. a molecule with the formula c h 3 c h c h 2. there is a c h 3 group attached to both the c h and c h 2 carbon.