Physical Properties Low boiling points,increasing with mass. Branched alkenes have lower boiling points. Less dense than water. Slightly polar -Pi bond is polarizable,so instantaneous dipole- dipole interactions occur. -Alkyl groups are electron-donating toward the pi bond,so may have a small dipole moment. Physical Properties ❖Low boiling points, increasing with mass. ❖Branched alkenes have lower boiling points. ❖Less dense than water. ❖Slightly polar ◼Pi bond is polarizable, so instantaneous dipole￾dipole interactions occur. ◼Alkyl groups are electron-donating toward the pi bond, so may have a small dipole moment