43. Which of the following has dipole moment? a.Both A and B b.trans-2-butene c.cis-2-butene d.1-propene
trans-2-Butene has no dipole moment because the bond moments of the two bonds to alkyl groups are opposed and cancel. In contrast, the dipole moment of cis-2-butene is 0.3 D because the bond moments of the two bonds to the methyl groups add to each other and do not cancel.
