Question

The IUPAC name for $C{H}_{3}CH=CHC{H}_{2}CH\left(N{H}_2\right)C{H}_{2}COOH$ is:

• A. 5-aminohex-2-ene carboxylic acid
• B. 5-amino-2-heptenoic acid
• C. 3-amino-5-heptenoic acid
• D. $\beta -$amino$-\delta$- heptenoic acid

Answer 1

The correct option is C 3-amino-5-heptenoic acid


Word root-seven carbon chain with a double bond in chain, so heptene.
Carboxylic acid gets priority as functional group and has 'oic acid' suffix. So heptenoic acid ('e' of heptene dropped because of the other vowel O). Double bond at $5^{th}$ carbon from carboxylic carbon and so 5-heptenoic acid.
The other substituent -$N{H}_2$ has a prefix amino and at $3^{rd}$ carbon
So IUPAC name is 3-amino-5-heptenoic acid.