JEE Main · 2007 · 29 Apr 2007 · Offline · Chemical Bonding and Molecular Structure

Which of the following hydrogen bonds is the strongest?

(A) $O - H \dots\dots . N$
(B) $F - H \dots\dots . F$ ✓ Correct
(C) $O - H \dots\dots\dots O$
(D) $O - H \dots\dots\dots F$

Answer: (B)

Solution

The strength of a hydrogen bond grows with the electronegativity of the atom carrying the hydrogen and of the atom accepting it. Fluorine is the most electronegative element, so the

F - H \dots F

linkage concentrates the most charge and binds most tightly. It is accordingly the strongest of the hydrogen bonds listed.

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

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