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  4. Which alkene in the following is most stable?

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Q. Which alkene in the following is most stable?

NTA AbhyasNTA Abhyas 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

Stability of alkene $\alpha $ no. of hyper conjugating structures $ \propto $ no. of $\text{α-H}$

$\text{CH}_{\text{3}} - \overset{\text{α}}{\text{CH}_{\text{2}}} - \text{CH} \, \text{=} \, \text{CH}_{\text{2}} \, \text{2} \, \text{H} \text{.C} \text{.}$

$\overset{\text{α}}{\text{CH}_{\text{3}}} - \text{CH} = \text{CH} - \overset{\text{α}}{\text{CH}_{\text{3}}} \, \, 6 \, \text{H} \text{.C} \text{.}$

$\text{CH}_{\text{3}} - \text{CH}_{2} - \overset{\text{α}}{\text{CH}_{\text{2}}} - \text{CH} \, \text{=} \, \text{CH}_{\text{2}} \, \, 2 \, \text{H} \text{.C} \text{.}$

$\text{CH}_{\text{3}} - \overset{\text{α}}{\text{CH}_{2}} - \text{CH} = \text{CH} \, - \, \overset{\text{α}}{\text{CH}_{\text{2}}} \, \, 5 \, \text{H} \text{.C} \text{.}$