Các CTCT thỏa mãn là:
\(C{H_2} = C = C - C{H_2} - C{H_3};{\text{ C}}{{\text{H}}_2} = CH - CH = CH - C{H_3};{\text{ C}}{{\text{H}}_2} = CH - C{H_2} - CH = C{H_2};{\text{ C}}{{\text{H}}_3} - CH = C = CH - C{H_3}\)
\(C{H_2} = C(C{H_3}) - CH = C{H_2};{\text{ C}}{{\text{H}}_3} - C(C{H_3}) = C = C{H_2}\)