NTA Abhyas JEE Main2020ChemistryChemical Bonding and Molecular StructurePractice
Pick out the incorrect statement.
Options
- AThe geometry around 'N' atom in trimethylamine is pyramidal
- BThe geometry around N atom in trisilylamine is planar
- CThe nitrogen atom in trimethylamine is s p 3 -hybridized; whilst in trisilylamine it is s p 2 -hybridized
- DTrisilylamine has donor properties; whilst trimethylamine has no donor properties
Correct answer
D. Trisilylamine has donor properties; whilst trimethylamine has no donor properties
Step-by-step solution
In trimethylamine, 'N' atom is s p 3 -hybridized. Due to the presence of lone pair in s p 3 -hybrid orbital, the geometry of ( C H 3 ) 3 N becomes pyramidal around nitrogen. This lone pair of electrons can be donated to electron-deficient species, e.g., ( C H 3 ) 3 N → B F 3 . This lone pair cannot be transferred to carbon atom, because carbon atom has no d-orbital in its valence shell. In ( S i H 3 ) 3 N , the 'N' atom is s p 2 -hybridized. The orientation of three s p 2 -hybrid orbitals is plane-triangular, there