sp Hybridization and Bonding in Acetylene (2.21) sp HYBRIDIZATION: applies when carbon is directly bonded to two atoms, as in Acetylene. Acetylene?s most prominent feature is its linear geometry. The sp Hybridization of acetylene combines a 2s orbital and one 2p orbital to generate two sp hybridized orbitals. These two sp orbitals share a common axis, but their major lobes are oriented at an angle of 180 degrees to each other. The carbons are connected at a 2sp-2sp sigma bond, and each is attached to a hydrogen by a 2sp-1s sigma bond. The two unhybridized 2p orbitals on one carbon overlap with their counterparts on the other to form to pi bonds. *In general you can expect that carbon will be sp hybridized when it is directly bonded to two atoms in a neutral molecule.*
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