How many of the following molecules or ions possess a completely planar structure (either linear, tr — Chemical Bonding Chemistry Question

💡 Solution & Explanation

$BF_3$ is trigonal planar. $XeF_4$ is square planar. $I_3^-$ is linear (which lies in a single plane). $CO_3^{2-}$ is trigonal planar. Conversely, $NH_3$ and $PCl_3$ are pyramidal, $SF_4$ is see-saw, and $CH_4$ is tetrahedral—all of which are non-planar 3D structures. Total = 4.