Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    8
    ReputationRep:
    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!
    Offline

    12
    ReputationRep:
    https://www.quora.com/Why-cant-double-bonds-rotate
    Offline

    16
    ReputationRep:
    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.
    Offline

    13
    ReputationRep:
    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...
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.