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    • Thread Starter
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    Hi.

    Can someone please explain to me (preferably in layman's terms) why there is restricted rotation about a double bond?
    I did some reading elsewhere, and most websites say there is restricted rotation because the Pi-Bond and Sigma-Bond overlap in 2 places, but I am having difficulty understanding/picturing how this mechanism works...

    Thanks!
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    https://www.quora.com/Why-cant-double-bonds-rotate
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    Think of a bond as a match stick or rod you can rotate.
    One ball connected to another ball via a stick can rotate pretty fine. O-O
    One ball connected to another ball with 2 match sticks cant rotate as you would have to rearrange the structure of the matchsticks to rotate. O=O
    Your pi bond and sigma bond explanation is probably what the examiner wants though.
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    I found a really good Youtube video that explains the lack of rotation around a C=C bond, and it modeled it using molecule toys and it's about the overlap of Pi and Sigma bonds over the double carbon bond...
 
 
 
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