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Question

The correct order of hydrogen bond strengths is:

A
ClHCl>NHN>OHO>FHF
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B
ClHCl<NHN<OHO<FHF
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C
ClHCl<NHN>OHO>FHF
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D
ClHCl<NHN<OHO>FHF
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Solution

The correct option is B ClHCl<NHN<OHO<FHF
Strength of H–bond polarity of Hatom EN of the atom attach to the Hatom
Higher the electronegativity of the element, higher will be the bond polarity of hydrogen.
Electronegative element withdraws the electron toward itself and create charge separation (polarity)
Electronegative order of the elements in given molecule is
F > O > N > Cl.
Thus strength of hydrogen bond is in the order,
ClH...Cl<NH...N<OH...O<FH...F

Hence, the correct answer is option (b).

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