Arrange the following compounds in decreasing order of acidic strength - 

Explanation:-

Acidic Strength:-

• Lewis acids are electron-pair acceptors while some acids are proton donors.
• HO^- is a conjugate base of water, where H₃O⁺ is the conjugate acid.
• Any molecule, atom or ion which stabilizes the conjugate base will always increase the acidity.
• The acidic character increases with the increase in formal charge in the molecule.
• Acidity is directly proportional to electronegativity.
• Resonance effect - delocalization of negative charge in a molecule increases acidity.
• Due to the increase in inductive effect acidic character increases.
• Due to higher s-character acidity increases.