Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Trimethylammonia is pyramidal whereas trisily lammonia is a planar molecule. Why?
A
In silicon atom, the electron pair of nitrogen is involved in 
bonding and and
bonding and and
B
In nitrogen, lone pair of electrons is present at nitrogen hence it has pyramidal shape. are correct. are wrong.
C
Both
D
Both
Text Solution
Verified by ExpertsThe correct answer is:
C
In silicon atom, there is a vacant d – orbital hence electron pair of nitrogen is donated to silicon by
bonding in trisilylammonia. 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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