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what is rotation about double bond and in what kind of organic compound is it possible?

what is rotation about double bond and in what kind of organic compound is it possible?

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1 Answers

Aarti Gupta
askIITians Faculty 300 Points
9 years ago
A double bond consists of a sigma bond and a pi bond respectively.Pi bond is formed by sideways overlapping of unhybridized p-orbitals of two carbon atoms above and below the plane of carbon atoms.If one of the carbon atoms of double bond is rotated with respect to the other,the p-orbitals will no longer overlap and pi bond gets break,but such breaking of pi bond requires 251 kj/mole of energy which is not provided by collision of molecules at room temperature.As a result the rotation about a carbon-carbon double bond is not free but is strongly hindered or restricted.Thus there is an energy barrier to rotation which is much greater than in the case of a single bond.Such restricted rotation around the double bonds accounts for the cis-trans isomerism in appropriately substituted alkenes.For ex- 2-butene exist in cis and trans form.

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