Question

Distinguish between the saturated hydrocarbon ethane and the unsaturated hydrocarbon ethene by drawing their structural formulae.

Answer 1

Saturated hydrocarbon (Ethane)	Unsaturated hydrocarbon (Ethene)
\[\begin{array}{cc} \phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\\ \phantom{....}|\phantom{...} \phantom{.}|\phantom{....}\\ \ce{H - C - C - H}\\ \phantom{....}|\phantom{...} \phantom{.}|\phantom{....}\\ \phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\\ \end{array}\]	\[\begin{array}{cc} \phantom{........}\ce{H}\phantom{...}\ce{H}\phantom{........}\\ \phantom{....}|\phantom{...} \phantom{.}|\phantom{....}\\ \ce{C = C}\\ \phantom{....}|\phantom{...} \phantom{.}|\phantom{....}\\ \phantom{........}\ce{H}\phantom{...}\ce{H}\phantom{........}\\ \end{array}\]
It has a carbon-carbon single bond.	It has carbon - carbon double bond
It is saturated.	It is unsaturated
Alkanes undergo a substitution reaction.	Alkenes undergo addition reaction.