stability of carbocations

ans given as first one.. seen this ques in two reliable sources so posted even had thot II

ans 2> III>II>I
( i just feel that it might be II>III>I)

ANS 1> carbocation I is more stable than II because the inductive effect of ethyl+ethyl> methyl+propyl

@ Debo, but the order for stability is:-
Mesomeric effect > conjugation > Hyper conjugation > I effect ????

Ya Sorry Hypconj is 1 st preference

III>II>I

Ya.dat's correct............the reason is inductive effect

sn2 mechanism genarly ocuur where there is no intermideate formed
and when tertiary carbocation formed sn1 i prefered.

but when secondray carbocation is forming as an intermidiate then whether there is substituion or elimination on carbon atom is decided by thermodynamic and kinetitics factor eg.temperature

if temp is increased ther will be elimination and alkene s formed and if substitution then neucliphile come on carbon atom and prevents frmation of alkene.

is this statement true or false ?

ii is more stable than i in ques 1
due to hyperconjugation which has more efecct then inductive effect

in the first question inductive effect will be same for both but due to hyperconjugation 1>2

in the second question the order is: 1>2>3
reason: all three are 1degree carbocation however on basis of hyperconjugation 1>2>3
do not confuse urself with the comparison of CH₃CH₂ I effect whith
hyperconjugation effect because hyperconjugation overpowers I effect in case of carbocation