Hydrocarbons Part 2

Concept:Alkene stability increases with more alkyl substitution due to hyperconjugation and the +I effect.Trans isomers are more stable than cis because of less steric hindrance.Explanation:Identify the substitution pattern of each alkene from the structures.$\mathrm{III}$ has three alkyl groups attached to the double bond (trisubstituted).$\mathrm{I}$ is a disubstituted alkene with a trans configuration.$\mathrm{II}$ is a disubstituted alkene with a cis configuration.$\mathrm{IV}$ is a monosubstituted alkene.Stability order: more substituted $>$ lesser substituted.Among disubstituted isomers, trans is more stable than cis.Thus, $\mathrm{III} > \mathrm{I} > \mathrm{II} > \mathrm{IV}$.Answer:Option A: III $>$ I $>$ II $>$ IV