Cyclopentyl ethyl ether can be obtained by:

 Major product is:

In the reaction

${\left({\mathrm{CH}}_3\right)}_3\mathrm{C}-\mathrm{O}-{\mathrm{CH}}_2{\mathrm{CH}}_3+\underset{ (1\mathrm{mole}) }{\mathrm{HI}}\stackrel{ \mathrm{heat} }{⟶}$

the product$\left(\mathrm{s}\right)$ formed is (are)

In the reaction

the major product formed is

Total number of compound$\left(\mathrm{s}\right)$ among following which will evolve ${\mathrm{H}}_2(\uparrow )$ on reacting with $\mathrm{Na}-$metal is/are :