Question

Q. How would you convert (a) ethanol to ethene (b) ethene to ethane.

Answer 1

a) Ethanol can be converted to ethene in presence of concentrated sulphuric acid. It is called as dehydration reaction.
CH_​3-CH₂-OH $\stackrel{\text{Concentrated}{\text{H}}_{2}S{O}_4}{\to }$ CH₂=CH₂ + H₂O

b) Ethene can be converted to ethane by addition of hydrogen molecule. It is known as hydrogenation reaction.
CH₂=CH₂ + H₂ $\stackrel{\text{Nickel catalys}t}{\to }$ CH₃-CH₃