Question

a compou d x on heating sulphuric acid at 443 give unsaturated compou d x ,y and also give colourless compound z identify x y and z

Answer 1

X => ethanol
Y => ethene
Z => Hydrogen gas

Explanation :- when Ethanol is heated with excess amount of concentrated sulphuric acid , gives unsaturated compound Ethene (C2H4)
here , conc. sulphuric acid as as dehydrating agent because it ejects water from ethanol.
reaction is ---
CH3CH2OH ----> CH2=CH2 + H2O { in the presence of Conc. H2SO4 at 443 K}

now, when Ethanol react with sodium , colorless gas e.g., Hydrogen gas evolved in reaction.
reaction is ---
2CH3CH2OH + Na --> C2H5ONa + H2