MCAT Organic Chemistry Question 38: Answer and Explanation
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Question: 38
8. π bonds are formed by which of the following orbitals?
- A. Two s-orbitals
- B. Two p-orbitals
- C. One s- and one p-orbital
- D. Two sp2-hybridized orbitals
Correct Answer: B
Explanation:
π bonds are formed by the parallel overlap of unhybridized p-orbitals. The electron density is concentrated above and below the bonding axis. A σ bond, on the other hand, can be formed by the head-to-head overlap of two s-orbitals, two p-orbitals, one s- and one p-orbital, or hybridized orbitals. In a σ bond, the density of the electrons is concentrated between the two nuclei of the bonding atoms.