Chapter 16.1, Problem 2CP

Which of the following species does not have a conjugate base? (Select all that apply.)

a)

${\text{HC}}_2{\text{O}}_4^{-}$

b)

${\text{OH}}^{-}$

c)

${\text{O}}^{2-}$

d)

${\text{CO}}_3^{2-}$

e)

$\text{HClO}$