Compound in which the arrangement of electron groups about the central atom is not tetrahedral

Question

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The molecule with the arrangement of electron groups about the central atom that is not tetrahedral is trigonal planar. Choice B, with three electron groups around the central atom, fits this description. Choices A, C, and D all have four electron groups around the central atom, which results in a tetrahedral arrangement.

Compound in Which the Arrangement of Electron Groups About the Central