MCAT General Chemistry Question 38: Answer and Explanation
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Question: 38
8. Which of the following is the best explanation of the phenomenon of hydrogen bonding?
- A. Hydrogen has a strong affinity for holding onto valence electrons.
- B. Hydrogen can only hold two valence electrons.
- C. Electronegative atoms disproportionately carry shared electron pairs when bonded to hydrogen.
- D. Hydrogen bonds have ionic character.
Correct Answer: C
Explanation:
Electronegative atoms bound to hydrogen disproportionately pull covalently bonded electrons toward themselves, which leaves hydrogen with a partial positive character. That partial positive charge is attracted to nearby negative or partial negative charges, such as those on other electronegative atoms.