Question
The correct order/s for the given pair of isomers is:
The correct order/s for the given pair of isomers is:
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Solution
The correct option is D 
Trans-2-butene has a higher melting point owing to better and more efficient packing.
Among the isomeric vicinal dichloroethanes, the cis isomer will have a higher dipole moment and thus a higher inter-molecular attraction. Hence, it will also have a higher boiling point.
More the dipole moment (charge separation) more is the solubility in water.
More diplole moment due to vectors in same direction.
Trans-2-butene has a higher melting point owing to better and more efficient packing.
Among the isomeric vicinal dichloroethanes, the cis isomer will have a higher dipole moment and thus a higher inter-molecular attraction. Hence, it will also have a higher boiling point.
More the dipole moment (charge separation) more is the solubility in water.
More diplole moment due to vectors in same direction.
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