. Which of the following is the most stable
A: 1 - butene
B: 2 - butene
C: 1 - pentene
D: 2 - pentene
Saytzeff's rule can be used to determine the stability of various alkenes.
According to Saytzeff's rule, the most stable alkene is the one that is highly substituted. A substituted alkene has carbon atoms that are doubly bonded to additional alkyl groups rather than hydrogen atoms.
Hyperconjugation increases the stability of a double bond when there are directly connected alkyl groups close to it. Each ∝ hydrogen atom in the alkyl group functions as a hydrogen, resulting in one hyperconjugative structure. The more hyperconjugative structures there are, the more stable the alkene is.
As a result, the alkene with the greatest number of hydrogens is the most stable.
In the case of 2-butene, the number of ∝ hydrogens are at their highest.
Final Answer :
Thus, we can say that option B ( 2- butene) is the correct answer.