Consider $H_{2} C = C H_{2}$ , ethene. If one $C H_{2}$ group is held in its position, while the other $C H_{2}$ group is rotated about the axis passing through nuclel C-C in ethene, then : Which of the following is wrong?

The other

C H_{2}

group moves out of plane of first

C H_{2}

group

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C-C

σ

bond breaks

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C-C

π

bond breaks

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C-C bond length increases

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Solution

The correct option is C C-C $π$ bond breaks
Rotation around C-C double bond will never break the $π$ bond. Hence option C.

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Consider H2C=CH2, ethene. If one CH2 group is held in its position, while the other CH2 group is rotated about the axis passing through nuclel C-C in ethene, then : Which of the following is wrong?

The correct option is C C-C π bond breaksRotation around C-C double bond will never break the π bond. Hence option C.

Consider $H_{2} C = C H_{2}$ , ethene. If one $C H_{2}$ group is held in its position, while the other $C H_{2}$ group is rotated about the axis passing through nuclel C-C in ethene, then : Which of the following is wrong?

The correct option is C C-C $π$ bond breaks
Rotation around C-C double bond will never break the $π$ bond. Hence option C.