In the presence of peroxide, styrene reacts with \(HBr\) to give \(X\). When \(X\) reacts 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 \(Z\)?
