An organic compound A on heating with concentrated H_(2)SO_(4) forms a compound B which on addition of one mole of hydrogenin presence of Ni forms a compound C. One mole of compound C on combustion forms two moles of CO_(2) and 3 moles of H_(2)O. Identify the compounds A, B and C and write the chemical equations of the reactions involved.

An organic compound A on heating with concentrated H_(2)SO_(4) forms a

1.	An organic compound A on heating with concentrated H_(2)SO_(4) forms a compound B which on addition of one mole of hydrogenin presence of Ni forms a compound C. One mole of compound C on combustion forms two moles of CO_(2) and 3 moles of H_(2)O. Identify the compounds A, B and C and write the chemical equations of the reactions involved.
Answer» Solution :Since compound C GIVES 2 moles of `CO_(2)` and 3 moles of `H_(2)O`, it shows that it has the molecular formula `C_(2)H_(6)` (Ethane). C is obtained by the addition of one mole of HYDROGEN to compound B so the molecularformula of B should be `C_(2)H_(4)`(Ethene).Compound B is obtained by heating compound A with concentrated `H_(2)SO_(4)` which shows it to be an alcohol. So compound A could be `C_(2)H_(5)OH` (Ethanol). `underset(A)(C_(2)H_(5)OH) overset("Hot conc. "H_(2)SO_(4))to underset(B)(C_(2)H_(4)) +H_(2)O` `underset(B)(C_(2)H_(4)) +H_(2) overset(Ni) to underset(C )(C_(2)H_(6))` `underset(C )(2C_(2)H_(6)) +7O_(2) to 4CO_(2)+6H_(2)O+` Heat and light