CBSE Class 10 Science 2018 Solved Paper

Question : 3 of 27

Marks: +1, -0

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.

Solution:

\Compound \X{──── ─▶}↖{\Heating}↙{{\excess.\conc}↙{\H_2\SO_4}↙{\at 443 \K}}\text "Unsaturated compound "\Y

{{\CH}_3- {\CH}_2 {\OH} }↙{\Ethanol}\;{\;\text " Conc. "\; {\H}_2 {\SO}_4}/{443 {\K}} {{\CH}_2= {\CH}_2}↙{\Ethene}+ {\H_2\O}↙{\water}

{\X}=\; {\CH}_3 {\CH}_2 {\OH} \;\text " (ethanol) "\;

{\Y}=\; {\CH}_2= {\CH}_2 \;\text " (ethene) "\;

\; {\CH}_3 {\CH}_2 {\OH}+ {\Na} → {\CH}_3 {\CH}_2 {\ONa}+ {\H}_2

{\Z}=

Hydrogen gas.
Here, concentrated sulphuric acid acts as a dehydrating agent, it removes water molecule from ethanol.

Go to Question:

Prev Question

Next Question