Q3 of 27 Page 1

A compound ‘X’ on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound ‘Y’. ‘X’ also reacts with sodium metal to evolve a colourless gas ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’. Write the equation of the chemical reaction of formation of ‘Y’ and also write the role of sulphuric acid in the reaction.

A compound X reacts with concentrated sulphuric acid at 443K to form an unsaturated compound Y. The reaction is –



Further X reacts with sodium metal to evolve a colourless gas Z



Here Z is hydrogen gas(H2)


Y is an unsaturated compound formed by reaction of X and conc. H2SO4. Hence, H2SO4 is acting as a dehydrating agent here .


X is Ethyl alcohol (C2H5-OH) and Y is an unsaturated hydrocarbon. Y is ethene(C2H4).


X-C2H5-OH


Y-C2H4


Z-H2



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