Which of the following is a polar protic solvent?

A $CH X_{3} CH X_{2} OH$
B $CH X_{3} CN$
C $(CH X_{3}) X_{2} SO$
D $CH X_{3} - CO - CH X_{3}$

Answer: A

A protic solvent has a hydrogen atom attached to O or N and can donate hydrogen bonds. Ethanol qualifies. DMSO, acetone and acetonitrile are polar but have no O-H or N-H bond (aprotic).

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