Chemistry - Nomenclature Question with Solution | TestHub

Identify the senior group: The carboxylic acid group (–COOH) has the highest IUPAC priority compared to the amide (–CONH₂) and nitrile (–CN) groups.

Determine the starting point: The principal carbon chain must begin at the carbonyl carbon of the senior-most –COOH group (C-1).

Trace the longest path: Moving from C-1 through the double bond and the –CH(CN)– group leads continuously to the amide carbon.

Count the chain length: Tracing this longest continuous path gives a total chain length of 6 carbon atoms (HOOC–CH=CH–CH(CN)–CH₂–CONH₂).