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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
"Hybridisation of central atom does not always change due to back bonding". This  statement is valid for which of the following compounds ?

$(i)\, {CCl_3}^-$       $(ii)\,CCl_2$     $(iii)\, (SiH_3)_2O$     $(iv)\, N(SiH_3)_3$

  • ✓
    $(i), (ii)$
  • B
    $(i), (iii)$
  • C
    $(ii), (iii)$
  • D
    All
✓

Answer

Correct option: A.
$(i), (ii)$
a
When there is back bonding from central to side atom change in hybridization takes place. Back bonding takes place when one atom has vacant orbital and one has lone pairs.

So central atom has a lone pair and side atom must have vacant orbital

So : $CCl _3^{-}$

$N \left( SiH _3\right)_3$

$sp ^3- sp ^2$

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