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Question: Identify correct order of stability:...

Identify correct order of stability:

A

2,3-dimethylbut-2-ene > 2-methylpropene

B

Left molecule < Right molecule

C

2-methylpropene < but-2-ene

D

Tetralin < Right molecule

Answer

Options (A) and (B) are correct.

Explanation

Solution

  • Stability of alkenes increases with the number of alkyl substituents and hyperconjugation (alpha hydrogens).
  • Aromaticity confers significant stability.
  • (A) Tetrasubstituted alkene (2,3-dimethylbut-2-ene) is more stable than a trisubstituted alkene (2-methylpropene).
  • (B) Comparing isomers of octahydronaphthalene with a double bond, the one with more alpha hydrogens (6 vs 4) is more stable.
  • (C) Trisubstituted alkene (2-methylpropene) is more stable than a disubstituted alkene (but-2-ene).
  • (D) Aromatic tetralin is much more stable than a non-aromatic bicyclic system.