What is the systematic name for this compound?

Question

BlackTom AI · Accepted Answer

To identify the systematic name, start by counting the ring size and noting the unsaturation.
Option 1: cyclononene — this would describe a nine-membered ring with a double bond, which does not match the eight-membered ring in the image.
Option 2: cyclopentane — this is a five-membered ring with no double bond; the structure shown has a double bond and more carbons, so this is incorrect.
Option 3: cyclohexene — this indicates a six-membered ring with a double bond; the diagram shows more than six carbons, so this option miscounts ring size.
Option 4: cyclooctene — this denotes an eight-membered ring with at least one double bond, which aligns with the eight-membered ring and the single C=C in the picture.
Option 5: cycloheptene — this would be a seven-membered ring with a double bond; again, the ring in the image is larger than seven members, so this is not a match.

Putting it together, the molecule is an eight-membered ring containing one double bond, which corresponds to cyclooctene (and can be named systematically as cyclooct-1-ene if using the locant form for the double bond, though cyclooctene is the common name shown here).

What is the systematic name for this compound?

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