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JEE Main levelSingle correct optionDifficulty 2 of 3cb135

The correct order of dipole moments of the dichlorobenzene isomers is

Ameta $>$ ortho $>$ para
Bortho $>$ meta $>$ para
Cortho $>$ para $>$ meta
Dpara $>$ meta $>$ ortho

Answer: B

The C-Cl bond dipoles are at

6 0^{\circ}

(ortho),

12 0^{\circ}

(meta) and

18 0^{\circ}

(para). The resultant is

2 m cos (θ /2)

, which is largest for ortho, smaller for meta, and zero for para.

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