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A hydrogen bond is: a. a strong attraction between hydrogen and another atom. b. a bond between a hydrogen atom already covalently bound to one atom and made partially negative by unequal electron sharing with another atom. c. a bond between a hydrogen atom already covalently bound to one atom and made partially positive by unequal electron sharing with another atom. d. weaker than van der Waals forces. e. exemplified by the two hydrogens covalently bound to oxygen in the water molecule.

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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892
BuyFind

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892

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Chapter
Section
Chapter 2, Problem 7TYK
Textbook Problem
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A hydrogen bond is:

a. a strong attraction between hydrogen and another atom.

b. a bond between a hydrogen atom already covalently bound to one atom and made partially negative by unequal electron sharing with another atom.

c. a bond between a hydrogen atom already covalently bound to one atom and made partially positive by unequal electron sharing with another atom.

d. weaker than van der Waals forces.

e. exemplified by the two hydrogens covalently bound to oxygen in the water molecule.

Expert Solution
Summary Introduction

Introduction:

Hydrogen bonds are weak forces of attraction between a hydrogen atom and an atom of small electronegative atoms. Sharing or electron transfer is not involved between atoms with hydrogen bonding between them. Covalent bonding is done in a way that hydrogen is partially positive and the electronegative atom is partially negative. Other weak forces include van der Waal’s forces. These occur in nonpolar molecules and are weaker than hydrogen bonds.

Explanation of Solution

Justification for the correct answer:

Option (c) is a bond between hydrogen atoms already covalently bound to one atom and made partially positive by unequal sharing with another atom. This is because such a hydrogen atom will have an electron deficiency due to a partial positive charge. Hence, option (c) is correct.

Justification for the incorrect answers:

Option (a) is a hydrogen bond is a strong attraction between hydrogen and another atom. A hydrogen bond is a weak force of attraction that occurs between partial positive charges bearing hydrogen, which is itself bonded covalently to some electronegative element. So, it is an incorrect option.

Option (b) is a hydrogen bond is a bond between a hydrogen atom already covalently bound to one atom and made partially negative by unequal sharing with another atom...

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