JEE Advanced 2023 Chemistry question on Basic Principles of Organic Chemistry

In the following reactions, P, Q, R, and S are the major products.

The correct statement(s) about P, Q, R, and S is(are)

1. A.
   P and Q are monomers of polymers dacron and glyptal, respectively.
2. B.
   P, Q, and R are dicarboxylic acids.
3. C.
   Compounds Q and R are the same.
4. D.
   R does not undergo aldol condensation and S does not undergo Cannizzaro reaction.

[JEE Advanced 2023 · Paper 2]