Which of the following anions is the weakest base?

A $C X_{2} H X_{5} O X^{-}$
B $HC \equiv C X^{-}$
C $C X_{6} H X_{5} O X^{-}$
D $CH X_{3} COO X^{-}$

Answer: D

The conjugate base of a stronger acid is a weaker base. Acetic acid (pKa 4.76) is stronger than phenol (10.0), ethanol (15.9) and ethyne (25), so acetate is the weakest base.

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Which of the following anions is the weakest base?

Answer: D

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