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yes the restriction is there because of pi-bond
think of it as a ball and it is inserted with a stick like in lollipop....but not stuck so if you spin it, it will spin in it's place but now if you attach two sticks with it, the ball wont spin any more because if it tries to rotate around one stick the other will stop it! so it's movement have been restricted!
that is the image i have of it in my mind
ooohh i got it thankks!! )...and i guess that if you want that rotation to occur you will have to break the pi system, and that requires energy. I´m not sure about this, so if anyone knows the answer please do say it.