Write the equations for the following lab. preparations:

(a) Ethane from sodium propionate.

(b) Ethene from iodoethane.

(c) Ethyne from calcium carbide.

(d) Methanol from iodomethane.

(a) Ethane [C₂H₆] from sodium propionate:

$\underset{\text{sodium propionate}}{\text{C}$2\text{H}5\text{COONa}} + \underset{\text{sodalime}}{\text{NaOH}} \xrightarrow[300\degree\text{C}]{\text{CaO}} \underset{\text{ethane}}{\text{C}2\text{H}6} + \text{Na}2\text{CO}3

(b) Ethene from iodoethane:

$\underset{\text{ iodoethane}}{\text{C}$2\text{H}5\text{I}} + \underset{\text{alcoholic}}{\text{KOH}} \xrightarrow{\text{boil}} \underset{\text{ethene [ethylene]}}{\text{H}2\text{C}=\text{C}\text{H}2} + \text{KI} + \text{H}_2\text{O}

(c) Ethyne from calcium carbide:

$\underset{\text{calcium carbide}}{\text{CaC}$2} + \underset{\text{water}}{2\text{H}2\text{O}} \longrightarrow \underset{\text{ethyne [acetylene]}}{\text{C}2\text{H}2} + \text{Ca(OH)}_2

(d) Methanol from idomethane.

$\text{CH}$3\text{I} + \text{NaOH} \longrightarrow \text{CH}3\text{OH} + \text{NaI}