Dependence of carbocation stability with respect to the length of alkyl group

• Which carbocation is more stable, the ethyl carbocation or n-propyl carbocation?
• What is the effect of alkyl group length on the stability of a carbocation?
• Your first question, which carbocation is more stable, ethyl or n-propyl, has already been answered (see here). – ron Mar 8 '16 at 19:20
• @ron actually i couldn't completely understand the answer (quite a high level for me).But what i found from your answer is ethyl cation is an exception right?.But i have a doubt,is it correct that only methyl group can show inductive effect (can -CH2- group show inductive effect?)?Also would you post a simple answer about the dependence on length of alkyl group. – Abhishek Pallippara gopakumar Mar 9 '16 at 15:46
• Yes $\ce{-CH2 -}$ can show an inductive effect, all alkyl groups can. – ron Mar 9 '16 at 15:52
• @ron thanks.Would you please explain me the dependence of +i effect on length?Is there any dependency?Am I wrong about this concept? – Abhishek Pallippara gopakumar Mar 9 '16 at 15:56
• There is likely a measurable difference between methyl and ethyl due to the hyperconjugation reasons mentioned in the answer below. Beyond that I would expect very small differences (for example between n-propyl and ethyl). – ron Mar 9 '16 at 16:15