Carbocation Rearrangement

Following two question have assertion followed by the reason. Answer them according to the following options Assertion Friedel Craf't alkylation of benzene with n-propyl chloride, fail to produce propyl benzene. Reason Carbocation rearrangement produces rearrangedd isopropyl benzene as major product.

Reaction Intermediates|| Carbocation|| Stability OF Carbocation|| Rearrangement OF Carbocation (Hydride, Alkyl and Phenyl shift Reaction)

The following transformation involves a carbocation rearrangement. The carbocation is generated by potonation of the hydroxyl group by the lose of water. Which bond has to migrate in the carbocation to yield the product indicated (after the deprotonation) ?

Vladimir Markovnikov rule: Alkenes undergo electrophilic addition reactions. It is triggered by the acid acting as a electrophile toward pi -electrons of the double bond. Markovnikov's rule states that when an unsymmetrically substituted alkene reacts with a hydrogen halide, the hydrogen atom adds to the carbon that has the greater number of hydrogen, e.g., In which of following reactions, carbocation rearrangement is possible?

Carbocation are

The less stable carbocation rearranges to more stable carbocation ion. During this rearrangement, the migrating atom or group leaves as a

Electrophilic Addition Reaction || Rearrangement OF Carbocation

Under common reaction conditions, a carboncation rearranges to another carbocation of equal or greater stability. For example secondary carbocation will rearrange to a tertiary carbocation. It will not rearrange to a less stable primary carbocation. This generalization is not absolute, and because there is not is a high energy barrier to the rearrangement of carbocations, rearrangement to a less stable cation can occur if it offers the chance to forme a more stable product. In which of the following cations rearrangement takes place?