Write the structural formula of ethanol. What happens when ...

CBSE Class 10 Science 2017 Outside Delhi Term II Set 1 Paper

Question : 7 of 36

Marks: +1, -0

Write the structural formula of ethanol. What happens when it is heated with excess of conc.

{\H}_2 {\SO}_4

443 {\K}

, ? Write the chemical equation for the reaction stating the role of conc.

{\H}_2 {\SO}_4

in this reaction.

Solution:

Structural formula of ethanol is :

{\CH}_3 {\CH}_2 {\OH}

When ethanol is heated with excess of conc.

{\H}_2 {\SO}_4

443 {\K}

it results in the dehydration of ethanol to give ethene.

\;{ {\CH}_3 {\CH_2} {\OH}}↙{\;\text " Ethanol "\;}\;{\;\text " Conc. "\; {\H}_2 {\SO}_4}/{43 {\K}} \; {\CH_2}↙{\;\text " Ethene "\;}= {\CH_2}+ {\H}_2 {\O}

Role of conc.

{\H}_2 {\SO}_4

: Conc.

{\H}_2 {\SO}_4

acts as a dehydrating agent which removes water from the ethanol.

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