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(B) Back bonding occurs when a lone pair from one atom is donated into a vacant orbital of an adjacent atom. This often leads to a change in the hybri

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$(i), (iii)$

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(B) Back bonding occurs when a lone pair from one atom is donated into a vacant orbital of an adjacent atom. This often leads to a change in the hybridisation of the central atom to maximize stability.$(i)$ $CCl_3^-$: The carbon atom has a lone pair,but chlorine does not have a vacant orbital available for back bonding. Thus,hybridisation remains $sp^3$.$(ii)$ $CCl_2$: This is a carbene where carbon has a lone pair and a vacant $p$-orbital. Back bonding from $Cl$ to $C$ occurs,but the hybridisation of $C$ remains $sp^2$.$(iii)$ $(SiH_3)_2O$: Oxygen has lone pairs and silicon has vacant $d$-orbitals. Back bonding occurs,changing the geometry,but the hybridisation of $O$ is often considered $sp^3$ in the context of bond angle changes.$(iv)$ $N(SiH_3)_3$: Nitrogen has a lone pair and silicon has vacant $d$-orbitals. Back bonding occurs,changing the hybridisation of $N$ from $sp^3$ to $sp^2$.Therefore,for $(i)$ and $(iii)$,the hybridisation does not change significantly or is not driven by the back bonding mechanism in the same way as $(iv)$.

Molecule	Hybridisation of central atom	Shape
$(a)$ $PCl_5$	$dsp^3$	square pyramidal
$(b)$ $[Ni(CN)_4]^{2-}$	$sp^3$	tetrahedral
$(c)$ $SF_6$	$sp^3d^2$	octahedral
$(d)$ $IF_3$	$dsp^3$	pyramidal

"Hybridisation of central atom does not always change due to back bonding". This statement is valid for which of the following compounds?
$(i)$ $CCl_3^-$ $(ii)$ $CCl_2$ $(iii)$ $(SiH_3)_2O$ $(iv)$ $N(SiH_3)_3$

Similar Questions

Is there any change in the hybridisation of $B$ and $N$ atoms as a result of the following reaction?
$BF_{3} + NH_{3} \rightarrow F_{3}B \cdot NH_{3}$

Identify the correct set from the following table:
Molecule Hybridisation of central atom Shape
$(a)$ $PCl_5$ $dsp^3$ square pyramidal
$(b)$ $[Ni(CN)_4]^{2-}$ $sp^3$ tetrahedral
$(c)$ $SF_6$ $sp^3d^2$ octahedral
$(d)$ $IF_3$ $dsp^3$ pyramidal

What is the type of hybridization of the central atom in the following molecules: $NH_3, PCl_5, SF_6, CCl_4$?

The types of hybrid orbitals of nitrogen in $NO_2^{+}$,$NO_3^{-}$ and $NH_4^{+}$ respectively are

What type of covalent bond is formed by hybrid orbitals?

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"Hybridisation of central atom does not always change due to back bonding". This statement is valid for which of the following compounds?$(i)$ $CCl_3^-$ $(ii)$ $CCl_2$ $(iii)$ $(SiH_3)_2O$ $(iv)$ $N(SiH_3)_3$