For each alkene, indicate the direction of the dipole moment. For each pair, determine which compound has the larger dipole moment.
a) cis-1,2-difluoroethene and trans-1,2-difluorothene
b) cis-1,2-dibromoethene and trans-1,2-dibromoethene
c) cis-1,2-dibromo-1,2-dichloroethene and cis-1,2-dichloroethene