Arrange the following compounds in order of increasing dipole moment : toluene (I), m-dichlorobenzene (II), o-dichlorobenzene (III), p-dichlorobenzene (IV)

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I < IV < II < III

IV < I < II < III

IV < I < III < II

IV < II < I < III

answer is B.

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Detailed Solution

μres = μ12 + μ22 + 2μ1 μ2 cos θOut of (II) and (III) ‘O’ isomer has more dipole moment.The increasing order of dipole-moment is :p-dichlorobenzene < toluene < m-dichlorobenzene < o-dichlorobenzene.

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