MHT CET Chemistry question

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

(A)I < IV < II < III
(B)IV < I < II < IIICorrect
(C)IV < I < III < II
(D)IV < II < I < III

Answer: (B)

Solution

p-Dichlorobenzene is symmetrical and its bond moments cancel (about 0 D), toluene has a small moment (about 0.4 D), m-dichlorobenzene about 1.5 D and

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Question ID VK-043673