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Predict whether the following molecules ...

Predict whether the following molecules are isostructural or not Justify your answer
`N(Me)_(3)` and `N(SiH_(3))_(3)` .

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The correct Answer is:
NO
No, (i) `NM e_(3)` is pyramidal while (ii) `N(SiM e_(3))_(3)` is planar. In the latter case, `p pi-d pi` back bonding between N and Si makes N `sp^(2)` - hybridised.
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