In the presence of peroxide, styrene reacts with HBr to give X . When X reacted with magnesium in dry ether followed by CO 2 and hydrolysis gave Y . Treatment of Y with PCl 5 and then next with H 2 , Pd - BaSO 4 gave Z . What is Z ?

Step-by-step solution

First step of the reaction involves free radical addition of HBr to styrene in presence of peroxide to form 1-bromo-2-phenyl ethane(X) 1-bromo-2-phenyl ethane on reaction with Mg in presence of dry ether forms a grignard reagent,Which reacts with CO 2 by nucleophilic addition mechansim followed by hydrolysis to form 3-phenyl propanoic acid(Y). 3-phenyl propanoic acid(Y) reacts with PCl 5 to form 3-phenyl propanoyl chloride. 3-phenyl propanoyl chloride undergoes rosenmund reduction in presence of Pd - BaSO 4 to form