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

Options

A. If assertion is true but the reason is false
B. If assertion is false but reason is true
C. If both assertion and reason are true and the reason is the correct explanation of assertion
D. If both assertion and reason are true and the reason is not the correct explanation of assertion

Answer

C

Explanation

In `(CH_(3))_(3)overset(..)(N), N` is `sp^(3)` hybridiazed pyramidal strucuture because of absence of vacant orbital on carbon atom therefore no back bonding 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