Question

Why the carbon of cyanide is not considered for parent chain in 7 cyano 3 oxo 4 heptenal?

Answer 1

Answer:As 7 Cyano 3 oxo 4 heptenal consist of an Aldehyde group as a functional group, so parent chain will be an Aldehyde and we can write IUPAC name by using -al as a suffix.Cyano group in this compound is a side group and not a carbon chain

Explanation:

CN-CH2-CH2-CH=CH-CO-CH2-CHO

       ↓      ↓       ↓     ↓    ↓     ↓      ↓

       7      6       5     4    3     2       1

7 Cyano 3 oxo 4 heptenal

Longest chain of carbon consist of 7 carbon, cyano group is a side group.