See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

2 H /H O/     O O CH CH3 CH2 CH3 [F] C O OH Liberate CO2 with NaHCO3 OH [M]  O H CH CH3 CH2 CH3  3 P PBr or HBr  Br CH CH3 CH2 CH3 [G] [I] Mg / dry ether  Q  Q NaCN/DMF NC CH CH3 CH2 CH3 3 H O /   HOOC CH CH3 CH2 CH3  K  M , H O C O CH CH3 CH2 CH3   L is metamer of E MgBr CH CH3 CH2 CH3 [J]  2 R