How would you bring the following conversions ?
(i) Ethyl alcohol to diethyl ether.
(ii) Diethyl ether to ethyl alcohol.
(iii) Ethyl iodide to diethyl ether.
(iv) Diethyl ether to ethyl iodide.
(v) Methyl iodide to methyl ethyl ether.

Explanation

[Hint]

`C_(2)H_(5)-O-C_(2)H_(5)underset(Delta)overset(HI)(rarr)2C_(2)H_(5)I overset(NaOH(aq.))(rarr) 2C_(2)H_(5)OH`
(iii) `C_(2)H_(5)Ioverset(NaOH(aq.))(rarr)C_(2)H_(5)OH overset(Na)(rarr)C_(2)H_(5)ONaoverset(C_(2)H_(5)I)(rarr)C_(2)H_(5)-O-C_(2)H_(5)`
(iv) `C_(2)H_(5)-O-C_(2)H_(5)underset(Delta)overset(HI)(rarr)2C_(2)H_(5)I`
(v)