Unsaturated hydrocarbons

1 mark · Easy

State what feature of alkenes makes them unsaturated hydrocarbons.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

They contain a carbon–carbon double bond.

Also accept: Presence of a C=C double bond

Common mistakes: Saying just ‘double bond’ without specifying carbon

Show mark scheme and worked solution

Marking points

B1 · 1 mark · States that alkenes are unsaturated because they contain a carbon–carbon double bond.

Worked solution

Alkenes are unsaturated because they have a carbon–carbon double bond (C=C) in their structure.