CH3-O-C2H5→conc.HI/∆X+Y; If ‘Y’ can liberate hydrogen with sodium metal then correct statement about ‘X’ is

When a mixed ether containing primary and secondary alkyl groups is heated with conc.HI, C-O cleavage occurs such a way that the halogen atom goes with smaller alkyl group;It follows SN2 mechanism;X=CH3I ; Y=C2H5OH ;X is highly reactive towards SN2 reactions;X is a  polar molecule;CH3-I+2Na+I-CH3→dry etherCH3-CH3+2NaI;CH3-I→Mg/etherCH3-MgI→H2OCH4+MgOHI ;