Answer the following question based on the given paragraph . Stability of carbocation…

Answer the following question based on the given paragraph .

Stability of carbocation, alkyl free radical and alkene can be explained on the basis of hyperconjugation.In all these cases, there is presence of hydrogen atom at the adjacent carbon atom of sp² hybridised carbon atom. Total number of hyperconjugating structures depends upon the number of hydrogen atoms present at adjacent carbon atom of sp² C-atom. More the hyperconjugating structures, more is the stability of the ion.

Decreasing order of stability of following alkenes is
(i) CH₃ – CH CH₂ (ii) CH₃ – CH CH – CH₃ (iii) (iv)