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Circle those carbon atoms which must lie in the same plane?

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    Can someone explain how to answer this?
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    Restricted rotation of the double bond means that the atoms bonded directly to it must be in the same plane.

    If we take the carbon on the right in the double bond to be the central atom it has 4 bp and no lp, assuming that double bods behave similarly to single it has a trigonal planar shape. All carbon atoms in a triginal planar shape are in the same plane as they arrange themselves the furthest distance apart, therefore it is all the carbon atoms except the carbon atom in the far bottom right which is in a different plane.
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