Paper: CSIR-NET December 2019 · Subject: Inorganic Chemistry · Chapter: Acids and Bases · Topic: Acids & Bases – General · Marks: 2 · Difficulty: Medium
Among $\mathrm{SO}_{2}(\mathrm{OH}) \mathrm{F}, \mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}, \mathrm{LiF}$ and $\mathrm{H}_{2} \mathrm{O}$, the compound(s) which behave(s) as a base in liquid HF is/are
(a)$\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}$ and LiF only
(b)LiF only
(c)$\mathrm{SO}_{2}(\mathrm{OH}) \mathrm{F}$ and LiF only
(d)$\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}$, LiF and $\mathrm{H}_{2} \mathrm{O}$
Answer
Answer: D ✓ checked by 4AB · confidence medium
The source book printed B; on checking, D is correct — see the explanation.
Explanation
In HF, CH₃CO₂H and H₂O are protonated and LiF supplies F⁻ — all three are bases; HSO₃F is an acid (d).