What causes the rotational barriers in alkenes?

{C (s p}^{2}) - C (p)

overlap

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{C (s p}^{3}) - {C (s p}^{3})

overlap

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C (p) - C (p)

overlap

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{C (s p}^{2}) - {C (s p}^{3})

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Solution

The correct option is C $C (p) - C (p)$ overlap
Alkenes cannot inter-convert due to the high barrier to rotation about the double bond which is a $p - p$ overlap.

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