Write balanced chemical equations for the following :

(i) Reaction between 1, 2 – dibromoethane and alcoholic potassium hydroxide.

(ii) Monochloro ethane is hydrolysed with aqueous KOH.

(iii) A mixture of sodalime and sodium acetate is heated.

(iv) Ethanol under high pressure and low temperature is treated with acidified potassium dichromate.

(v) Water is added to calcium carbide.

(vi) Ethanol reacts with sodium at room temperature.

(i) Reaction between 1, 2 – dibromoethane and alcoholic potassium hydroxide:

(ii) Monochloro ethane is hydrolysed with aqueous KOH:

$\underset{\text{ Chloroethane [ethyl chloride]}}{\text{C}$2\text{H}5\text{-Cl}} + \text{KOH [aq.]} \xrightarrow{\text{boil}} \underset{\text{ Ethanol [ethyl alcohol]} }{\text{C}2\text{H}5\text{-OH}} + \text{KCl}

(iii) A mixture of sodalime and sodium acetate is heated:

$\underset{\text{sodium acetate}}{\text{CH}$3\text{COONa}} + \underset{\text{sodalime}}{\text{NaOH}} \underset{\Delta}{\xrightarrow{\text{CaO}}} \underset{\text{methane}}{\text{CH}4} + \text{Na}2\text{CO}3

(iv) Ethanol under high pressure and low temperature is treated with acidified potassium dichromate:

$\underset{ \text{ ethanol[ethyl alcohol]}}{\text{C}$2\text{H}5\text{OH}} \xrightarrow[\text{K}2\text{Cr}2\text{O}7]{\text{[O]}} \underset{\text{ethanal [acetaldehyde] }}{\text{CH}3\text{CHO}} \xrightarrow[\text{K}2\text{Cr}2\text{O}7]{\text{[O]}} \underset{ \text{ethanoic acid[acetic acid]} }{\text{CH}3\text{COOH}}

(v) Water is added to 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

(vi) Ethanol reacts with sodium at room temperature:

$\underset{\text{ ethanol} }{2\text{C}$2\text{H}5\text{OH}} + 2\text{Na} \longrightarrow \underset{\text{ sodium ethoxide} }{2\text{C}2\text{H}5\text{ONa}} + \text{H}_2