Kaplan diagnostic No. 132 (discrete)

[SaintJude]

Which of the following compounds has the highest dipole moment?

a. o-dimetylbenzene
b. m-nitrosulfoxybenzene
c. p-dihydroxybenzene
d. p-amino nitrobenzene

Answer: D

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[pfaction]

I guessed D: Amino may be + and Nitro is -. A don't make sense, it's non polar through and through. C is the same as A, but it's polar, but also symmetrical. Between B and D, I chose D. I dunno.