Which one of the following is a polar aprotic solvent?

Aacetic acid, $CH X_{3} COOH$
Bdimethyl sulfoxide, $(CH X_{3}) X_{2} S = O$
Cethanol, $CH X_{3} CH X_{2} OH$
Dwater, $H X_{2} O$

Answer: B

A polar aprotic solvent has a high dielectric constant but no O-H or N-H bond to donate hydrogen bonds. DMSO fits; water, ethanol and acetic acid all contain O-H groups.

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Which one of the following is a polar aprotic solvent?

Answer: B

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