MCQ
Which of the following moleucles do not exist ?
- A$BiI_5$
- ✓$SH_4$
- C$BrF_6^-$
- DBoth $(A)$ and $(B)$
✓
Answer
Correct option: B.
$SH_4$
b
With an increase in size, the bond dissociation enthalpy decreases. Fluorine has exceptionally low bond dissociation enthalpy because of the high electronegativity but higher than iodine.
With an increase in size, the bond dissociation enthalpy decreases. Fluorine has exceptionally low bond dissociation enthalpy because of the high electronegativity but higher than iodine.
So the increasing order of bond dissociation enthalpies is $Cl _2\,>\, Br _2\,>\, F _2\,>\, I _2$.
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