${\mathrm{CH}}_3-\mathrm{O}-{\mathrm{C}}_2{\mathrm{H}}_5\stackrel{\mathrm{conc}.\mathrm{HI}/∆}{\to }\mathrm{X}+\mathrm{Y};$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 ${\mathrm{SN}}_2$ mechanism;

$\mathrm{X}={\mathrm{CH}}_3\mathrm{I} ; \mathrm{Y}={\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH} ;$

X is highly reactive towards ${\mathrm{SN}}_2$ reactions;

X is a  polar molecule;

${\mathrm{CH}}_3-\mathrm{I}+2\mathrm{Na}+\mathrm{I}-{\mathrm{CH}}_3\stackrel{\mathrm{dry} \mathrm{ether}}{\to }{\mathrm{CH}}_3-{\mathrm{CH}}_3+2\mathrm{NaI};$

${\mathrm{CH}}_3-\mathrm{I}\stackrel{\mathrm{Mg}/\mathrm{ether}}{\to }{\mathrm{CH}}_3-\mathrm{MgI}\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }{\mathrm{CH}}_4+\mathrm{Mg}\left(\mathrm{OH}\right)\mathrm{I} ;$