List of top Chemistry Questions on reaction mechanism asked in AP EAPCET

Among the following, identify the compound which will form resonance stabilized carbocations after the leaving group is lost.
Compounds: I, II, III, IV
In the presence of peroxide, styrene reacts with HBr to give X. When X is treated with magnesium in dry ether followed by CO$_2$ and hydrolysis, Y is formed. Treatment of Y with PCl$_5$, then with H$_2$/Pd-BaSO$_4$ gives Z. What is Z?
Identify the major product of the following reaction (Zn-Hg/HCl reduction).
Zn-Hg/HCl reduction
Identify P and Q respectively of the following reaction:
P and Q respectively of the following reaction