Naming organic compounds

2 marks · Normal

Write the IUPAC name for the following compound:

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.

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1-pentene

Also accept: pent-1-ene; Pent-1-ene; 1-pentene

Common mistakes: 2-pentene; pentene

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Marking points

M1 · 1 mark · Identifies the compound as a five-carbon alkene, and starts numbering from the correct end.

A1 · 1 mark · Gives the correct IUPAC name: 1-pentene (allow pent-1-ene).

Worked solution

This compound has 5 carbons in a chain. The double bond starts at the first carbon, so the IUPAC name is 1-pentene (or pent-1-ene).