# Benzylic and allylic carbocation stability order [closed]

Most books I have read stop at this order :
Benzylic > Allylic > Tertiary > secondary > primary
However If I want to compare tertiary, secondary and primary benzylic and Allylic carbocations what will be their stability order?

• Tertiary benzylic carbocations should be stabilised more due the $+M$ effect of three benzylic groups. The same should apply for allylic carbocations. – Gokul Apr 28 '15 at 17:06
• Should the answer then be tertiary benzylic>Secondary benzylic>primary benzylic> tertiary Allylic > secondary allylic> primary Allylic > tertiary> primary> secondary – novak Apr 28 '15 at 17:08
• Yes, seems correct to me. – Gokul Apr 28 '15 at 17:10
• There is no simple general rule for this. The rules you state are also not "absolute". – Jori Apr 29 '15 at 16:18
• Can you clarify what you mean by tertiary benzylic etc. Do you mean three phenyl groups (trityl cation) or one phenyl group and two alkyl groups? – bon Nov 30 '15 at 15:54