[phymatter]

if there is a choice between H , CH₃ and Phenyl group for rearrangement to stabalize a carbocation , what is the preference followed ? is there no exception to this rule ??
thanks in advance !!!!! 

[Grundalizer]

Which of those functional groups would be better for stabilizing a charge?

 The positive "+" charge is going to sit on a carbon, so which one of those has more carbons? 

Hydrogen is out of the question, so which do you think is better between a methyl group and phenyl group?  Which one has more resonance structures?  Multiple resonance structures is a good indication of an organic compound being able to stabilize charge

[Honclbrif]

http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/rearrang.htm

[phymatter]

if phenyl shift takes place the crbocation will not be stabilized by resonance :

consider 2 cases :
carbocation is stabilized by :
1.2 methyl groups
2.1 methyl and 1 phenyl group , which will be more stable

please *delete me*!