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What is the geometry of nitrogen atom in NH₃, N(CH₃)₃ and N[Si(CH₃)]₃ molecules?
I : Trigonal Planar
II : Trigonal PYramidal
III : Square Planar

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II, II, I

II, I, II

II, II , Il

I, I, I

answer is C.

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Detailed Solution

In case of NH₃: Trigonal pyramidal due to lp-bp repulsion. N(CH₃)₃ : same as in NH₃ but in case of N[Si(CH₃)₃] it is

planar. It is due to the fact that lone-pair on N-atom is transferred to the empty d-orbitals of silicon (p $Ï$ -d $Ï$ o verlapping) and its Lewis base character is lost.

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