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I was going through my organic notes and found this order of stability of carbocation:

3° benzylic > 2° benzylic > 2° allylic > 3° alkyl

I understand that all this is explained on the basis of combined result of resonance and inductive effect. What if one has to predict these?

For example, if I ask you where will you place 3° allylic and where will you place $\ce{Ph-(CH+)-C=R}?$ How to decide the order in these cases if this kind of question comes up in an exam?

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  • $\begingroup$ Combining electronic effects of inductive as well as mesomeric type. As you said. $\endgroup$
    – Alchimista
    Feb 15 at 10:14
  • $\begingroup$ @Alchimista Thanks for the comment 1st of all secondly,where will we place the given compound in the order that I have mensioned? $\endgroup$ Feb 16 at 8:11

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