Doubt from Mixed reaction type problem

How to solve this?
P.S this is a more than 1 correct option type problem.

Answers

A,B,C,D

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But what about that "P2 on reaction with MnO2 ..."

I didn't get that part. Can you explain ?

P2 is oxalic acid, MnO2 and H2SO4 will oxidize it to CO2 and H2O