Question

The increasing order of the strength of hydrogen bond in the following mentioned linkages is:
(i) $OH-S$ (II) $SH-O$ (iii) $FH-F$ (iv) $FH-O$

• A. (i) < (ii) < (iv) < (iii)
• B. (ii) < (i) < (iv) < (iii)
• C. (i) < (ii) < (iii) < (iv)
• D. (ii) < (i) < (iii) < (iv)

Answer 1

The correct option is B (ii) < (i) < (iv) < (iii)

Strength of $H-$bond depends on following factors:
(i) Electronegativity of element covalently bonded to hydrogen atom.
(ii) Size of electronegative element.
(iii) Ease of donation of lone pair of electrons by electronegative element.
Electronegativity order: $F>O>S$

Hence, the order is (ii) < (i) < (iv) < (iii).