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why compound CH2 =CH-CH2 (carrying negative charge) is planar. if it is because it has partial double bond character then it must lie between trigonal and tetrahedral structure. why only planar?

why compound CH2=CH-CH2(carrying negative charge) is planar. if it is because it has partial double bond character then it must lie between trigonal and tetrahedral structure. why only planar? 

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1 Answers

Bhavya
askIITians Faculty 1281 Points
8 years ago
The general hybridisation of carbanion is sp3 but when it is in resonance then it’s hybridisation becomes sp2 and that’s obvious because resonance can take place only when the resonating groups are in same plane.
Due to resonance, each C-C bond is having partial double bond character and is thus planar.

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