Among SO2(OH)F, CH3CO2H, LiF and H2O, the compound(s) which behave(s) as a base in liquid HF is/are

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CSIR-UGC (NET) Chemical Science: Held on (15 Dec 2019)
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  1. CH3CO2H and LiF only
  2. LiF only
  3. SO2(OH)F and LiF only
  4. CH3CO2H, LiF and H2O

Answer (Detailed Solution Below)

Option 4 : CH3CO2H, LiF and H2O
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Detailed Solution

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Concept:

According to the solvent theory, an acid is a proton doner and a base is a proton acceptor in presence of a solvent. In this theory, the solvent is the bridge or a shared compound between the acid and the base, which promotes the transfer of protons between them.

It's used in polar aprotic solvents like liq.HF , acetone, ether etc.

Explanation:

In above reaction H2O acts as a base where as liq.HF acts as an acid.

H2SO3F is one of the strongest Bronsted acid which is   stronger than that of liq.HF.

Among SO2(OH)F, CH3CO2H, LiF and H2O, the compound(s) which behave(s) as a base in liquid HF is/are CH3CO2H, LiF and H2O.

Conclusion:

Therefore, option (4) is the correct one.

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