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Assertion : (CH_(3))_(3)N geometry is pyramidal but in case (SiH_(3))_(3)N it is planar. Reason :The maximum covalency of Si is six but that of C is four.

Answer»

If assertion is true but the reason is false
If assertion is false but reason is true
If both assertion and reason are true and the reason is the CORRECT explanation of assertion
If both assertion and reason are true and the reason is not the correct explanation of assertion

Solution :In `(CH_(3))_(3)overset(..)(N), N` is `sp^(3)` hybridiazed pyramidal strucuture because of absence of VACANT orbital on carbon ATOM thereforeno BACKBONDING is possible
In `(SiH_(3))_(3)N, N` is `sp^(2)` hybridized, on the basis of `ppi-dpi` back bonding `(SiH_(3))_(3)N` resulting into triangular planar structure.
COVALENCY of both C and Si is four


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