Carbocation rearrangement in dehydration of an alcohol [closed]








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[![enter image description here](https://i.stack.imgur.com/DyEK2.jpg)](https://i.stack.imgur.com/DyEK2.jpg)


In this problem, I know that initially a positive charge is formed at the carbon bearing the hydroxyl group , yielding a secondary carbocation.


But, I can't go any further with that. What kind of ring expansion could this be ?


How would we end up with 2 fused rings of different sizes and why?
Is there any alkyl shift or hydride shift preceding the ring expanison?


I don't know how to predict the direction in which the expansion proceeds after the first step.


Can someone pls help me out with this?
Thanks in Advance.




Answer should be 1.


Refer to the picture below, this may help you:


[![reaction mechanism](https://i.stack.imgur.com/eSkTu.jpg)](https://i.stack.imgur.com/eSkTu.jpg)


 -1