Question

Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of _________.

Options

• Dehydration

• Dehydrogenation

• Dehydrohalogenation

• Hydrolysis

Answer 1

Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of dehydration.

Explanation:

Conc. \[\ce{H2SO4}\] is a useful dehydrator since it turns alcohol into an alkene by removing the water molecule.

\[\begin{array}{cc}
\phantom{..}\ce{H\phantom{...}OH}\phantom{..............................}\\
\phantom{}|\phantom{....}|\phantom{..............................}\\
\ce{H - C - C - H ->[Conc.][H2SO4] H - C = C - H + H2O}\\
\phantom{.}|\phantom{....}|\phantom{..................}|\phantom{....}|\phantom{........}\\
\phantom{.}\ce{\underset{Ethanol}{H\phantom{...}H}\phantom{.................}\underset{Ethene}{H\phantom{...}H}}\phantom{........}\end{array}\]