Question

a compound X on heating with excess conc sulphuric acid at 443k gives qn unsatuarated compound Y. X also reacts with sodium metal to evolve a colorless gas Z. identify X Y Z

Answer 1

X is ethanol (C2H5OH)

Y is ethene (C2H4)

Z is hydrogen (H2)

Answer 2

Compound X - Ethanol

Compound Y - Ethene

Compound Z - Hydrogen gas

Explanation:

A compound Ethanol (X) on heating with excessive amount of sulphuric acid at 443 k gives an unsaturated compound (Ethene)Y.  

The chemical reaction is as follows:

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \stackrel{\mathrm{H}_{2} \mathrm{SO}_{4}}{\longrightarrow} \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{H}_{2} \mathrm{O}$

Ethanol reacts with sodium and releases  sodium ethoxide compound and hydrogen gas.

The chemical reaction is as follows:

$2 \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}+\mathrm{Na} \rightarrow \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{ONa}+\mathrm{H}_{2}$

Therefore, the unknown compounds X, Y, and Z are Ethanol, Ethene, and Hydrogen gas.