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Question

Ortho-chloro phenol is less polar than O-fluoro phenol. Why?

A
Intra molecular H-bonding
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B
Inter molecular Hydrogen bonding
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C
Size of Cl as compared to size of F
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D
Cl is a gas
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Solution

The correct option is C Size of Cl as compared to size of F

The angle between the substituents, OH and Cl, OH and F should ideally be 60. Since Cl is much bigger than F, the angle between OH and Cl increases. This results in reduction of cos θ values used in calculation of net dipole moment.

This results in net dipole moment dropping to lower value.


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