Arrange the following alkenes in decreasing order of their stability (most stable to least stable): (i) (ii) (iii) (iv) (v)

Step-by-step solution

The stability of alkenes is determined by the number of -hydrogens (hyperconjugation) and the degree of substitution. More substituted alkenes are generally more stable. Analyzing each alkene: (i) Propylidenecyclohexane is a trisubstituted alkene. The number of -hydrogens is 2 (from one adjacent ring carbon) + 2 (from the other adjacent ring carbon) + 2 (from the adjacent - CH ₂- in the chain) = 6 . (ii) Allylcyclohexane is a monosubstituted alkene. The number of -hydrogens is 2 (from the - CH ₂- group between the