List of top Chemistry Questions on Acid-base concepts and principles

The descending order of acidity among the following compounds is :

Amongst the following, the total number of compounds soluble in aqueous NaOH at room temperature is:

What will be the decreasing order of basic strength of the following conjugate bases?
\( \text{OH}^-, \, \text{R}^-, \, \text{CH}_3\text{COO}^-, \, \text{Cl}^- \)

Which is Lewis acid?