Answer:
Following are the answer to this question:
Step-by-step explanation:
The most stable carbocation is:

- The means of
is a hydrocarbon with
, which is needed to find the double bonds.
- The formula for calculating the unsaturation hydrocarbons are:
Degree of the unsaturation

Where,
C=9, N=0, X=0, H=12


which means 3 double bonds and 1 ring.
- The most stable carbocation is given in the attachment file. please find the attachment.