Question

Which of the following molecules is not a lone pair donor?

• A. $(C_2{H}_5{)}_{2}NH$
• B. $(C_2{H}_5{)}_{3}N$
• C. $(Si{H}_3{)}_{3}N$
• D. $C_2{H}_{5}OH$

Answer 1

The correct option is C $(Si{H}_3{)}_{3}N$

The lone pair of $N$ of trisilylamine involves in $p\pi -d\pi$ back bonding with an empty d orbital of $Si$. This makes it unavailable to donate.