Correct statements about I and II are
A) Boiling point of I < II
B) Melting point of I < II
C) Dipole moment of I > II
D) Enthalpy of hydrogenation of I > II

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B, C and D only

A, B, C and D

A, C and D only

A, B and D only

answer is B.

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Detailed Solution

Dipole moment of cis-2-butene is higher than trans-2-buetne because both bulky groups present on the same side. It is more polar than trans-2-butene, therefore high intermolecular forces, higher boiling point, higher solubility and high enthalpy of hydrogenation.

II) Melting point of cis-2-butene is lower than trans-2-butene because of less packed structure. Stability of trans-2-butene is also greater than cis-2-butene.

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