Diethyl ether on heating with excess of $\mathrm{HI}$ yields

When diethyl ether is heated with conc. sulphuric acid under pressure, it forms

When vapour of ethyl alcohol are passed over ${\mathrm{Al}}_2{\mathrm{O}}_3$ at $250°\mathrm{C}$, it forms

Tert. butyl chloride on treatment with sodium alkoxide yield

Diethyl ether on treatment with ${\mathrm{Cl}}_2$ in presence of sunlight gives

Complete combustion of ether gives?

Which of the following pairs of reagents will not form ether?