A) In silicon atom, the electron pair of nitrogen is involved in \[p\pi -d\pi \]bonding.
B) In nitrogen, lone pair of electrons is present at nitrogen hence it has pyramidal shape.
C) Both [a] and [b] are correct.
D) Both [a] and [b] are wrong.
Correct Answer: C
Solution :
In silicon atom, there is a vacant d-orbital hence electron pair of nitrogen is donated to silicon by \[p\pi -d\pi \] bonding in trisilylammonia and gets \[s{{p}^{2}}\] hybridized hence, it has a planar structure. In trimethyl ammonia, the shape is pyramidal due to presence of lone pair of electrons at nitrogen.
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