(i) How will you bring about following conversion? Write the concerned chemical equations:
(a) Ethanol to Ethene (b) Ethanol to Ethanoic acid.
(ii) Give one example with chemical equation for following reactions:
(a) Substitution reaction (b) saponification (c) combustion reaction.

Explanation

(i) (a) `underset("Ethanol")(CH_(3)CH_(2)OH)underset(4443K)overset(H_(2)SO_(4)(conc.))tounderset("Ethene")(CH_(2)=CH_(2))+H_(2)O`
(b) `underset("Ethanol")(CH_(3)CH_(2)OH)underset(("Oxidation"))overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))tounderset("Ethanoic acid")(CH_(3)COOH)`
(ii) (a) `underset("Methane")(CH_(4))+Cl_(2)underset("sun light")overset("Diffused")toCH_(3)Cl+HCl`
(b) `underset("Ethylethanoate")(CH_(3)COOC_(2)H_(5))+NaOHtounderset("Sod. Ethanoate")(CH_(3)COONa)+underset("Ethanol")(C_(2)H_(5)OH)`
(c) `underset("Ethene")(2C_(2)H_(4))+5O_(2)overset(heat)to4CO_(2)+2H_(2)O`.