Question

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

• A. trans isomer has the higher M.P.
• B. cis isomer has higher B.P.
• C. both A and B
• D. none of these

Answer 1

Answer: (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 .