| description | acid |
| This is a three carbon acid with no carbon-carbon double bonds. There is a hydroxy group on the second carbon (counting the -COOH carbon as number 1) | |
| This is a four carbon acid. There's a chlorine attached to the second carbon, the number 3 bond furthest from the -COOH is a double bond (en) | |
| This is a four carbon acid with no carbon-carbon double bonds. There is a methyl group on the third carbon | |
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