Polar vs nonpolar molecules

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Despite being nonpolar, the trans isomer of 1,2-dichloroethane has a higher melting point (−50 oC) than the cis isomer (−80 oC) because of higher symmetry which allows for compact packing in the solid phase. In contrast, the cis isomer is a polar molecule with a higher boiling point (60 oC vs 48 oC ) because of the net molecular dipole moment and intermolecular dipole-dipole interactions. Hydrogen Bonding, Intermolecular Forces, Organic Chemistry Study, Chemistry Basics, Functional Group, Chemical Bond, Chemistry Lessons, Chemistry Notes, Boiling Point

Despite being nonpolar, the trans isomer of 1,2-dichloroethane has a higher melting point (−50 oC) than the cis isomer (−80 oC) because of higher symmetry which allows for compact packing in the solid phase. In contrast, the cis isomer is a polar molecule with a higher boiling point (60 oC vs 48 oC ) because of the net molecular dipole moment and intermolecular dipole-dipole interactions.

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