Which of the following are stronger bases than hydroxide ion? (pKa of conjugate acids: H2 about 35, methane about 48, phenol 10.0, acetic acid 4.76, water 15.7)

JEE Main levelOne or more correct optionsDifficulty 2 of 3g2085

Which of the following are stronger bases than hydroxide ion? (pKa of conjugate acids: $H X_{2}$ about 35, methane about 48, phenol 10.0, acetic acid 4.76, water 15.7)

A base is stronger than

OH X^{-}

if its conjugate acid is weaker than water (pKa greater than 15.7). This holds for

H X^{-}

(35) and

CH X_{3} X^{-}

(48), but not for phenoxide (10.0) or acetate (4.76).