Which of the following is planar due to back | vedclass

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(C) In $N(SiH_3)_3$,the nitrogen atom has a lone pair of electrons. Silicon has vacant $3d$ orbitals. The lone pair on the nitrogen atom is donated in

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$N(SiH_3)_3$

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(C) In $N(SiH_3)_3$,the nitrogen atom has a lone pair of electrons. Silicon has vacant $3d$ orbitals. The lone pair on the nitrogen atom is donated into the vacant $3d$ orbital of silicon,forming a $p\pi-d\pi$ back bond. This back bonding changes the hybridization of nitrogen from $sp^3$ to $sp^2$,making the molecule planar (trigonal planar). While $BF_3$ is also planar,it is planar due to its $sp^2$ hybridization and the nature of its bonding,but $N(SiH_3)_3$ is a classic example of a molecule that becomes planar specifically due to back bonding where it would otherwise be pyramidal like $N(CH_3)_3$.

List-$I$	List-$II$
$(1)$ ${\rm{NO}}$	$(A)$ $1.5$
$(2)$ ${\rm{CO}}$	$(B)$ $2.0$
$(3)$ ${\rm{O}}_2^-$	$(C)$ $2.5$
$(4)$ ${\rm{O}}_2$	$(D)$ $3.0$

Which of the following is planar due to back bonding?

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Match the species given in List-$I$ with their bond orders given in List-$II$.

List-$I$ List-$II$

$(1)$ ${\rm{NO}}$ $(A)$ $1.5$

$(2)$ ${\rm{CO}}$ $(B)$ $2.0$

$(3)$ ${\rm{O}}_2^-$ $(C)$ $2.5$

$(4)$ ${\rm{O}}_2$ $(D)$ $3.0$

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