Question

The correct IUPAC name of the following structure is :

• A. 1-(cyclooct-3-enyl)-oct-2-ene
• B. 4-(oct-1-enyl)-cyclooct-1-ene
• C. 8-(cyclooct-3-enyl)-oct-6-ene
• D. 3-(oct-2-enyl)-cyclooct-1-ene

Answer 1

The correct option is B 4-(oct-1-enyl)-cyclooct-1-ene

Rules for determining parent chain :
If both the open chain and the ring have equal unsaturation then, parent chain is the longest chain.

If both the open chain and the ring have equal unsaturation and equal number of ‘C’ atoms, then ring is considered to be the parent chain.



Here, both unsaturation and C atoms are equal in ring and open chain, so, ring is considered to be the parent chain
The correct IUPAC name if the structure is :
4-(oct-1-enyl)-cyclooct-1-ene