Question

Which of the following alkenes is most stable? 

• A.
• B.
• C.
• D.

Hint:

When evaluating alkene stability, consider hyperconjugation and the inductive effects of alkyl substituents on the double bond, as they significantly contribute to the stability.

Answer 1

The Correct Option is D

The stability of alkenes can be determined based on the degree of substitution of the double bond. Generally, the more substituted the double bond, the more stable the alkene. The options given include:
- Option 1: Cyclohexene, a monosubstituted alkene.
- Option 2: 1-methylcyclohexene, a disubstituted alkene.
- Option 3: Tetrahydropyran, a monosubstituted alkene.
- Option 4: A disubstituted alkene with alkyl groups on each carbon of the double bond, enhancing stability through hyperconjugation and alkyl substituent effects.
Among these, the alkene in Option 4 is most stable due to its disubstitution and favorable electronic effects conferred by the alkyl groups adjacent to the double bond.