Hydride shifts and methyl shifts can occur in organic chemistry reactions if there is a carbocation intermediate. While Markovnikov's rule placed the carbocation on the more substituted of the 2 former sp2 (double bound) carbon atoms, if there is an EVEN MORE substituted carbon nearby you'll get a carbocation rearrangement.
This video helps you understand the logic behind the carbocation rearrangement, along with specific patterns to look for when deciding between a hydride shift or methyl shift.
(watch this video or YouTube or view the transcript – coming soon)
Click for previous video – Acid Catalyzed Hydration
Next video: – ring expansion
This is video 6 in the Alkene Reaction Mechanism series. Click to see the entire series