Question

In which case geometry of the molecule is pyramidal?

• A. $N(C{H}_3{)}_3$
• B. $N(Si{H}_3{)}_3$
• C. Both (a) and (b)
• D. None of these

Answer 1

The correct option is A $N(C{H}_3{)}_3$

${N(CH}_3{)}_3$ is pyramidal.

${N(SiH}_3{)}_3$ is planar: The N atom in ${N(SiH}_3{)}_3$ is $s{p}^2$ hybridized. it has a lone pair of electron which is forming a bond with d-orbital of Si atom forming d$\pi$ and p$\pi$ bonding.