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The correct order of dipole moments of ortho-, meta-, and para-dichlorobenzene is

1. ortho > para > meta
2. para > ortho > meta
3. meta > ortho > para
4. ortho > meta > para

Correct answer: ortho > meta > para

Solution

For para-dichlorobenzene the two C-Cl dipoles point in exactly opposite directions and cancel (mu = 0). For ortho (60 deg apart) the resultant is sqrt(3)*mu₀, and for meta (120 deg apart) it is mu₀. Hence the order is ortho > meta > para.

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