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Question 770010
JEE Chemistry · Hard

Hydrocarbons: Stability of alkenes MCQ

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Stability of alkenesHardQuestion 770010

Question

The stability order of alkenes is:
  1. A
    More substituted > less substituted
    Correct
  2. B
    Less substituted > more substituted
  3. C
    All equal
  4. D
    Depends on temperature only

Correct answer

More substituted > less substituted

Explanation

Hyperconjugation and inductive effects from alkyl groups stabilise alkenes. Order: tetrasubstituted > trisubstituted > disubstituted > monosubstituted > ethylene. Heats of hydrogenation confirm this: more stable alkene releases less heat when hydrogenated.

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