Q14 / 155 · WBJEE 2018 · Chemistry

Which of the following has the strongest H-bond?

  • A
    $0-H-S$
  • B
    $\mathrm{S}-\mathrm{H}-\mathrm{O}$
  • Correct answer
    C
    $F-H$. F
  • D
    $F-H-O$

Solution

The strongest H-bond is $\mathrm{F}-\mathrm{H}-\mathrm{F}$ because in this case, a hydrogen is bonded to a most. electronegative atom i.e. fluorine. In all other options, hydrogen is bonded to oxygen and sulphur that are less electronegative atom than fluorine. The correct electronegativity order of elements are as follows: $\mathrm{F}>\mathrm{O}>\mathrm{S}$

Hence, the correct answer is option: 'C'.

More Chemical Bonding and Molecular Structure Questions