Among the following molecules,the N-Si bond l | vedclass

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(C) In these molecules,$p\pi-d\pi$ back-bonding occurs between the lone pair of Nitrogen ($2p$ orbital) and the empty $3d$ orbital of Silicon.In $NH_2

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$NH_2(SiH_3)$

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(C) In these molecules,$p\pi-d\pi$ back-bonding occurs between the lone pair of Nitrogen ($2p$ orbital) and the empty $3d$ orbital of Silicon.In $NH_2(SiH_3)$,the lone pair of Nitrogen is donated to only one Silicon atom,resulting in the highest double bond character per bond and thus the shortest $N-Si$ bond length.In $N(SiH_3)_3$,the lone pair is shared among three Silicon atoms,which reduces the double bond character per bond compared to $NH_2(SiH_3)$.

Among the following molecules,the $N-Si$ bond length is shortest in:

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