The order of stability of three alkenes $R C H = C H R, R_{2} C = C H R$ and $R_{2} C = {C R}_{2}$ is :

R C H = C H R > R_{2} C = C H R > R_{2} C = {C R}_{2}

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R C H = C H R < R_{2} C = C H R > R_{2} C = {C R}_{2}

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R C H = C H R > R_{2} C = C H R < R_{2} C = {C R}_{2}

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R C H = C H R < R_{2} C = C H R < R_{2} C = {C R}_{2}

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Solution

The correct option is D $R C H = C H R < R_{2} C = C H R < R_{2} C = {C R}_{2}$
Highly substituted alkenes are more stable. Thus, the order of stability will be:
$C R_{2} = C R_{2} > R_{2} C = C H R > C H R = C H R$

Hence option D is correct.

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