What is the correct order of the strength of H -bond in the following systems?
(I) F-H .. F
(II) O-H .. O
(III) N-H .. N
(IV) O-H .. N

Question

What is the correct order of the strength of H -bond in the following systems? (I) F-H .. F (II) O-H .. O (III) N-H .. N (IV) O-H .. N

TestHub · Accepted Answer

Question Explanation: Comparing the strength of hydrogen bonds in different systems.

Concept: Electronegativity and H-bond strength.

Solution: H-bond strength depends on the electronegativity of the atoms involved. Higher electronegativity of the donor makes H more acidic, while higher electronegativity of the acceptor increases attraction, though N is a better donor of lone pairs than O .

Electronegativity order: $F > O > N$ . Strength: $F - H \dots .. F$ is strongest; O-H.....N is stronger than O-H.....O due to N's better basicity.

Final Answer: I $>$ II $>$ IV $>$ III

Chemistry - CHEMICAL BONDING Question with Solution | TestHub

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