Question

In which of the following compounds, observed bond angle is found to be greater than expected, due to back bonding?

• A. $N(Si{H}_3{)}_3$
• B. $O(C{H}_3{)}_2$
• C. $O(Si{H}_3{)}_2$
• D. All of these

Answer 1

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

In $N(Si{H}_3{)}_3$, $Si$ has vacant d-orbitals and nitrogen has a lone pair of electrons so to stabilize the molecule, back bonding occurs as a result of which observed bond angle is greater.