In the context of carbocation rearrangements, what is the general order of migratory aptitude (migrating tendency) for groups shifting to an adjacent positively charged carbon (assuming no lone-pair s

Question

In the context of carbocation rearrangements, what is the general order of migratory aptitude (migrating tendency) for groups shifting to an adjacent positively charged carbon (assuming no lone-pair stabilization is present)?

Prashant Kotian · Accepted Answer

Correct answer: B. The general migratory aptitude for a 1,2-shift to a simple carbocation (where the resulting cation is not exceptionally stabilized by lone pairs) is largely determined by the electron-donating ability of the migrating group. The standard order is Hydride () > Phenyl () > Tertiary Alkyl > Secondary Alkyl > Primary Alkyl > Methyl.

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