Question

Find correct option regarding physical property of cis/trans isomer :

• A. trans isomer has the higher melting point
• B. cis isomer has higher boiling point
• C. both (a) and (b)
• D. none of the above

Answer 1

The correct option is C both (a) and (b)

Boiling point depends upon intermolecular interactions which over here is more in cis due to its net dipole moment. The dipole moment enables electronic interactions which hold molecules together. The shape of a compound is very important and has a dramatic effect on its melting point. More symmetrical molecules pack into the crystal lattice better, allowing closer approach and larger attractive forces, resulting in higher melting points.