Chemistry - Nomenclature Question with Solution | TestHub

Question Explanation:  

Name the compound shown (contains aldehyde, alkene and alkyl groups).

Concept:

This is based on IUPAC nomenclature of compounds containing functional groups.

Solution:  

The principal functional group is –CHO, so its carbon  (C-1 = CHO) must be part of the main chain.

Next, we choose the chain that contains the maximum number of unsaturation, so the C=C must also lie on the parent chain. 

Next priority goes to maximum number of carbon atoms and then maximum number of branches/substituent groups.

Hence, the principal carbon chain has 6 carbon atoms rather than 8.  

IUPAC name: 4-Butylhexa-2,5-dienal .