MCAT General Chemistry Question 196: Answer and Explanation
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Question: 196
7. In VSEPR theory, T-shaped is a sub-class of the trigonal bipyramidal geometric family in which the central atom has exactly three atoms bound to it and two lone pairs of electrons. Which of the following molecules is T-shaped?
- A. Covalent
- B. Electrostatic
- C. Metallic
- D. Coordinate covalent
Correct Answer: D
Explanation:
D This is an example of a Lewis acid-base reaction. In this type of reaction, one species accepts an electron pair from another species and a coordinate covalent bond is formed. One member of the bond donates both electrons in the bond. Whereas a coordinate covalent bond is a type of covalent interaction, the questions asks for the best answer, and coordinate covalent is more specific (eliminate choice A). Therefore, choice D is correct. An electrostatic bond is an ionic bond (eliminate choice B), and a metallic bond involves long-range delocalization of valence electrons, which is not the case in the product molecule (eliminate choice C).