Work Sheet 1, structure 6.
The species shown is a carbocation. In its resonance hybrid, over how many atoms is the positive charge shared (atoms carrying delta+) ?

Question

Work Sheet 1, structure 6. The species shown is a carbocation. In its resonance hybrid, over how many atoms is the positive charge shared (atoms carrying delta+) ?

TestHub · Accepted Answer

The cation is conjugated only with the C=C between the two ring-fusion carbons (allyl type) : delta+ on the cation carbon and on the other fusion carbon = 2. The second ring C=C is attached to the first fusion carbon only, which is a node of the allyl system, so it does not extend the delocalisation.

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