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Question


Which of the following will have the least dipole moment?

A
I
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B
II
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C
III
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D
Both (I) and (II)
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Solution

The correct option is C III
In ionic form of compound (I), both rings are aromatic in nature with 6 and 2 π-electrons. Hence, the ionic form will be more stable and have more dipole moment.
In ionic form of compound (II), again both rings are aromatic in nature with 6π- electrons. Hence, the ionic form will be more stable and have more dipole moment.
In ionic form of compound (III), one ring is aromatic with 6π- electron and other ring is antiaromatic with 4π-electrons. This will destabilise the ionic form of the compound. Hence, its dipole moment will be comparitively lower than (I) and (II).

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