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p -Block elements - ll — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Which of the following moleucles do not exist ?
  • A
    $BiI_5$
  • ✓
    $SH_4$
  • C
    $BrF_6^-$
  • D
    Both $(A)$ 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.

So the increasing order of bond dissociation enthalpies is $Cl _2\,>\, Br _2\,>\, F _2\,>\, I _2$.

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