How do I compare the acid strengths of the following compounds?

#1

How do I compare the acid strengths of the following compounds ?

The correct answer is (C).

#2

In option R and S, R>S because if we extract H from S option from any carbon atom there will be repulsion between negative charge and lone pair of oxygen.andin option R we will extract H from right carbon atom and negative charge will have resonance with ketone.

#3

To check acid strength, see in COOH there is resonance (movement of electrons from one oxygen to other through carbon atom) this is given higher priority
Next alcohol . Clearly there is one option with clear understanding.

#4

Acidity increases with the ease of removing a proton (H+ ion).
In (R) and (S) structures, you should take the effect of O attached to the compound into consideration.
In (S) creating a -ve ion will cause repulsion with the electron cloud of O present in the ring and the ion created by the extraction of a proton. This causes instability of the ion.

in (R), lone pair of an electron will from resonance with the ion so produced. The O atom also shows electronegativity property that pulls the electron cloud from less electronegative parts. Thus, it will further stabilize the compound.