carb is the structure of the carbocation intermediate that leads to the indicated products.
Carbocation: It is an organic molecule, an intermediate, that has a carbon atom bearing a positive charge and three bonds instead of four
The reaction given in the question is shown below.
carb1-----fig(1)
Given reaction
The reaction starts with the removal of the bromide ion to generate the carbocation. The carbocation is generated near the four-membered ring.
The methylene shift occurs to rearrange the carbocation by forming a five-membered ring.
carb2----fig(2)
Bromide ion removal
This carbocation accounts for the formation of the products given in the question. Two alkenes are formed by the elimination reaction and the ether is formed by the substitution reaction.
carb3----fig(3)
Elimination and substitution of products
Thus, the carbocation formed in the reaction is shown below.
carb1-------fig(4)
Fig (4) shows the final Structure of the carbocation intermediate.
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