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AQA GCSE · Question 08.3 · Organic chemistry
Figure 9 is a repeat of Figure 8. Draw a circle around the ester functional group on Figure 9.
Figure 9 is a repeat of Figure 8. Draw a circle around the ester functional group on Figure 9.
How to approach this question
The question asks you to identify the ester functional group. Recall the structure of the ester linkage.
Full Answer
A circle should be drawn around the -COO- group of atoms.
An ester is a type of organic compound formed from the reaction of an alcohol and a carboxylic acid. The functional group that defines an ester is the ester link, which has the structure -COO-. This consists of a carbon atom double-bonded to one oxygen atom and single-bonded to another oxygen atom. In the given molecule, this group is present, linking the alkene part of the molecule to the methyl group.
Common mistakes
✗ Circling only the C=O (carbonyl) group.
✗ Circling only the C-O (ether) link.
✗ Circling the C=C double bond (alkene group).
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