CH3−O−CCH33 →ΔConc.  HI X+Y.     X and Y in the reaction are ______ ,  mechanism followed by the reaction is ______

Mixed ethers containing 10 alkyl groups and 20 allyl groups when heated with conc. HI give alkyl halide in which halogen atom is attached to smaller alkyl group. Mechanism is SN2.Mixed ethers containing  30(or) benzyl group is heated with conc. HI. The halogen atom goes with  30 alkyl group (or) benzyl group. Mechanism is SN1