Question

What is the correct IUPAC name of the following compound?

• A. 4-propyneylhept-1,6-diene
• B. 4-ethenylhepta-1,4-diene
• C. 4-ethenylhepta-1,6-diene
• D. 4-ethenylhept-1,4-diene

Answer 1

The correct option is C 4-ethenylhepta-1,6-diene

The correct numbering in the present case is one that gives lowest possible number to double bond.

While naming polyenes and poly-ynes, alphabet ‘a’ will be added just after word root.If more than one multiple bond is present, then we have to indicate their numbers using di, tri, tetra, etc.

At 4th position of the longest chain, an alkenyl group is present as substituent.



So, the correct IUPAC name of the compound is 4-ethenylhepta-1,6-diene