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Question

The dipole moments of o, p and m - dichlorobenzene will be in the order:

A
o>p>m
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B
p>o>m
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C
m>o>p
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D
o>m>p
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Solution

The correct option is D o>m>p

The magnitude of net resultant dipole moments of two dipole moment vectors (μ1 and μ2 ) is given by,

μnet = (μ21+μ22+2μ1μ2 cosθ)

The magnitude of net dipole moments depends on the angle between the two moments. In the para form, the angle between the two moments is 180o and cos180o=1. Thus, it has the least dipole moment (Zero).
Again, among the ortho and the meta form, meta form has a greater angle between the two moments. Thus, it has a lower dipole moment compared to the ortho form. Thus, the correct order is
o>m>p

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