1. The following triatomic compounds must of course be planar. However, their shape may be linear or bent. Choose one of these shapes for each compound.
2. The shape assumed by the atoms of the following compounds may be trigonal-planar, square-planar, pyramidal or tetrahedral. Choose one of these shapes for each compound.
Note that these terms generally refer to the configuration of substituent atoms about a central higher-valenced atom.