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Bonding and Hybridisation Questions

Qu 1 :  A σ bond is said to be "symmetric with respect to the internuclear axis", is the same true of a π bond ?

Qu 2 : What is the hybridisation of the carbon atoms in allene or 1,2-propadiene : H2C=C=CH2 ?

Qu 3 : What molecular orbitals are involved in the bond that connects the methyl group to the double bond in propene H2C=CH-CH3 ?

Qu 4 : Is H22- a stable molecule ?

Answers ?

organic chemistry © Dr. Ian Hunt, Department of Chemistry University of Calgary