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Organic Chemistry: Orbitals

Problems: Valence Bond Theory

Valence Bond Theory

Molecular Orbital Theory

Problem : Give the hybridization and geometry of the starred (*) atoms in the molecules below.

Figure %: Problem 1

Solution (a) sp 2 , trigonal planar
(b) sp 3 , tetrahedral
(c) sp 3 , trigonal pyramidal
(d) sp 3 , bent

Problem : Allene has the following molecular structure:

Problem 2
Give a complete valence bond picture of allene, including all σ and Π interactions. (Hint: allene is not a planar molecule.)

Solution The center carbon is sp hybridized while the end carbons are sp 2 . The hydrogens on one end of the molecule are perpendicular to those on the other end.

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