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Problem: Two isomers of the planar compound 1,2-dichloroethylene are shown here, along with their melting and boiling points. Which of the two isomers will have the stronger dipole-dipole forces?

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Two isomers of the planar compound 1,2-dichloroethylene are shown here, along with their melting and boiling points.Cis isomer: C is double bonded to C. The C on the left is single bonded left angled up to H and left angled down to Cl. The C on the right is single bonded right angled up to H and right angled down to Cl. Trans isomer: C is double bonded to C. The C on the left is single bonded left angled up to Cl and left angled down to H. The C on the right is single bonded right angled up to H and right angled down to Cl.

Which of the two isomers will have the stronger dipole-dipole forces?

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