The numbering sequence is shown below:
The molecular formula for the molecule is C8H14 which is 4 hydrogens "short", giving 2 degrees of unsaturation (one for each ring).
The molecular formula for the molecule is C8H14 which is 4 hydrogens "short", giving 2 degrees of unsaturation (one for each double bond).
The molecular formula for the molecule is C6H6 which is 8 hydrogens "short", giving 4 degrees of unsaturation (one for the ring and one for each of the double bonds).
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