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MCAT Question A Day - 4/21/13 - Answer!

Hybrid orbitals form

A.  sigma bonds only.
B.  pi bonds only.
C.  sigma and pi bonds.
D.  lone-pair orbitals and sigma bonds.

The correct answer is (D). Hybrid orbitals around central atoms overlap with orbitals of bonding atoms along the internuclear axis to form sigma bonds. Nonbonding or lone-pair electrons occupy hybrid orbitals of the central atom.