MCAT Organic Chemistry Question 36: Answer and Explanation

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Question: 36

6. Two atomic orbitals may combine to form:

I. a bonding molecular orbital.

II. an antibonding molecular orbital.

III. hybridized orbitals.

A. I only
B. III only
C. I and II only
D. I, II, and III

Correct Answer: D

Explanation:

When atomic orbitals combine, they form molecular orbitals. When two atomic orbitals with the same sign are added head-to-head or tail-to-tail, they form bonding molecular orbitals. When two atomic orbitals with opposite signs are added head-to-head or tail-to-tail, they form antibonding molecular orbitals. Atomic orbitals can also hybridize, forming sp³, sp² or sp orbitals.

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