What is a hydrogen bond?
A) It is a covalent bond between hydrogen and oxygen.
B) It is a bond between a hydrogen atom and another strongly electronegative atom (such as oxygen or nitrogen) which is present in another molecule.
C) It is the bond between hydrogen and ionised atoms (such as phosphorus).
D) It is a strong bond which allows bonding between non-polar molecules.
E) It is the bond which occurs between hydrogen and oxygen within a water molecule.
IMAT 2024 · Question 11
Q11 - Biological importance of weak interactions
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The correct answer is B) It is a bond between a hydrogen atom and another strongly electronegative atom (such as oxygen or nitrogen) which is present in another molecule.
A hydrogen bond is a weak attraction between a hydrogen that's bonded to O, N or F and an electronegative atom in another molecule (or another part of a big molecule). It's what holds water molecules together and the two DNA strands to each other.
A and E describe the O–H bond inside a water molecule, which is a covalent bond. That's the opposite of what a hydrogen bond is: one is inside the molecule, the other is between molecules.
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