X and Y respectively in the above conversion are

1st step is decarboxylation. It is carried out by heating C6H5COONa with soda lime (NaOH +CaO)C6H5COONa+NaOH→ΔCaOC6H6+Na2CO3A→BCH3CH2CH2Cl+AlCl3→CH3CH2C+H2+AlCl4−CH3−CH2−C+H2⇌shift1,  2  H-CH3−C+H−CH3H++AlCl4−→AlCl3+HClIn presence of FeCl3, rearrangement of carbocation cannot occur. FeCl3 is a weaker Lewis acid as compared to anhydrous AlCl3.in such case,