Question

The increasing order of the strength of hydrogen bond in the following mentioned linkages is
(i) $O-H-S$ (ii) $S-H-O$ (iii) $F-H-O$ (iv) $F-H-O$

• A. $\left(i\right)<\left(ii\right)<\left(iv\right)<\left(iii\right)$
• B. $\left(ii\right)<\left(i\right)<\left(iv\right)<\left(iii\right)$
• C. $\left(i\right)<\left(ii\right)<\left(iii\right)<\left(iv\right)$
• D. $\left(ii\right)<\left(i\right)<\left(iii\right)<\left(iv\right)$

Answer 1

Answer: (B)

$\left(ii\right)<\left(i\right)<\left(iv\right)<\left(iii\right)$

The increasing order of the strength of hydrogen bond in the (i) $O-H-S$ (ii) $S-H-O$ (iii) $F-H-O$ (iv) $F-H-O$ linkages is $\left(ii\right)<\left(i\right)<\left(iv\right)<\left(iii\right)$. In $H-F$, $F$ is most electronegative. Hence, the strength of hydrogen bond is maximum in $\left(iii\right)$. In $\left(ii\right)$, $S$ is least electronegative. Hence, the strength of hydrogen bond is minimum in $\left(ii\right)$.