Concept explainers
Interpretation:
Molecular geometry and electron geometry about nitrogen atom in the acetone imine molecule is to be predicted.
Concept introduction:
Electron geometry and molecular geometry of molecules is determined by using Valence shell electron pair repulsion (VSEPR) theory. According to VSEPR theory, electron geometry describes the orientation of the electron groups about a particular atom, and molecular geometry describes the arrangement of atoms about a particular atom.
Number of electron pairs describes the electron and molecular geometry. If all the electron pairs are bonds, then molecular geometry is the same as electron geometry. Electron geometry is different from molecular geometry if some electron pairs are present as lone pairs.
Electron geometry and molecular geometry from the number of electron pairs are as follows:
Number of electron pairs |
Number of Bonds |
Number of Lone pair |
Electron geometry | Molecular Geometry |
2 | 2 | 0 | Linear | Linear |
3 | 3 | 0 | Trigonal planar | Trigonal planer |
3 | 2 | 1 | Trigonal planar | Bent |

Answer to Problem 2.1P
Electron geometry about N atom in acetone imine molecule geometry is trigonal planar and molecular geometry is bent.
Explanation of Solution
The given acetone imine molecule is
In acetone imine molecule, there are total three groups of electrons about N atom. There is one double bond, one single bond, and one lone pair around N atom, that is, all electron pairs are not involved in bond formation, and hence, molecular geometry and electron geometry are different.
There are total three electron groups, hence, the electron geometry about N atom is trigonal planar. The molecular geometry is bent.
Electron geometry and molecular geometry about N atom is predicted from the number of electron pairs present around the atom in the given molecule.
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Chapter 2 Solutions
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