Carbon-carbon bond length in ethene is _______ to that in $C H_{2} = C H O C H_{3}$ .

shorter

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longer

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equal

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none of the above

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Solution

The correct option is A shorter
$C H_{2} = C H - O - C H_{3} \leftrightarrow C H_{2}^{-} - C H = O^{+} - C H_{3}$
Due to resonance in methyl vinyl ether, the bond order of $C - C$ is slightly reduced from two while in ethene $C - C$ bond order is exactly 2. Hence, Carbon-carbon bond length in ethene is shorter than in $C H_{2} = C H O C H_{3}$ .

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