Interpretation:
The shape of the labelled atoms in the below structure of enanthotoxin needs to be determined.
Concept introduction:
Shape of a molecule is determined by including only the bond pair not the lone pairs on the central atom while geometry includes both the bond pairs and lone pairs on the central atom. Valence shell electron pair repulsion theory or VSEPR theory used in chemistry as a model for the prediction of shape of various molecules by knowing the electron pairs on the central atom. There will be repulsion between the electron pairs present on central atom, so to minimize the repulsion they adopt an arrangement with minimum repulsion, thus determining molecule's shape. And by knowing the shape we can easily determine the bond angles.
The following table should be used while determining the shapes:
Number of groups | Number of lone pairs | Shape | Bond angle | |
2 | 2 | 0 | Linear | |
3 | 3 | 0 | Trigonal planar | |
4 | 4 | 0 | Tetrahedral | |
4 | 3 | 1 | Trigonal pyramidal | |
4 | 2 | 2 | Bent |
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