Which of the following statement is false to trisilylamine?

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The N-Si bond length is shorter than the expected N-Si bond length.

Three ${sp}^{2}$ orbitals are used for $σ$ bonding giving a plane triangular structure

The lone pair of electrons occupy a p-orbital at right angles to the plane triangle and this overlaps with empty p-orbitals on each of the three silicon atoms resulting in $π$ bonding.

It is a weaker Lewis base than trimethyl amine.

answer is B.

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Detailed Solution

The lone pair of electrons occupy a p-orbital at right angles to the plane triangle and this overlaps with empty p-orbitals on each of the three silicon atoms resulting in $π$ bonding statement is false for trisilylamine.

The bonding assertion is untrue for trisilylamine because the single pair of electrons occupies a p-orbital that is at an angle to the plane triangle and overlaps with unoccupied p-orbitals on each of the three silicon atoms.