Write the chemical equations for the following chemical reactions and name the carbonic compound obtained.
(i) Reaction of acidified potassium dichromate solution with ethanol on heating.
(ii) Reaction of sodium metal with ethanol.
(iii) Reaction of concentrated sulphuric acid with ethanol at 443 K.

Explanation

(i) Ethanol is oxidised to ethanoic acid with the help of acidified `K_(2)Cr_(2)O_(7)`.
`CH_(3)CH_(2)OH +2[O]rightarrowCH_(3)COOH + H_(2)O`
(ii) Ethanol reacts with sodium metal to form sodium ethoxide and hydrogen gas.
`2C_(2)H_(5)OH rightarrow2C_(2)H_(5)ONa+H_(2)`
(iii) Ethene is formed when ethanol is heated at 443 K with pricentrated sulphuric acid Concentrated readtion and sulphuric acid acts as dehydrating agent in this reactionand removes a molecule of water.
`CH_(3)CH_(2)OH overset(H_(2)SO_(4))underset"443K"to CH_(2)=CH_(2)+H_(2)O`