An alkene contains a double bond.Why is the C 
C of an alkene rigid and unable to freely rotate?
A) The C 
C bond is very strong, and it is impossible to break it.
B) The σ bond gets blocked by the hydrogen atoms.
C) The sp2 hybrid orbitals of carbon take up too much room.
D) The π electrons are delocalized through the σ bonds.
E) The 2p orbitals of the π bond overlap above and below the C -C plane to restrict rotation.
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