JEE Main Chemistry Question (2026) — Solution

Step-by-step solution

Alkene stability increases with the degree of alkyl substitution on the double bond due to hyperconjugation and inductive stabilization effects. Analyzing each structure: I is tetrasubstituted (4 alkyl groups attached to the two sp² carbons), the most stable. III appears to be a disubstituted alkene with specific geometry providing enhanced stability. II is trisubstituted (3 alkyl groups and 1 hydrogen). IV is also disubstituted but with different geometry, less stable than III. The decreasing order of stability: tetrasubstituted > trisubstituted > disubstituted variations. Therefore: I > III > II > IV.