See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

2 H Lindlar catalyst  C H C CH OH CH CH2 1 2 3 4 5 C H2 CH CH OH CH CH2 H2/Pd PCC (Optically active [P]) C H2 CH C O CH CH2 [Q] C H3 CH2 CH OH CH2 CH3 PCC  C H3 CH2 C O CH2 CH3 [R] (Optically inactive)