Which among the following chemical species have a strictly planar geometry? — Chemical Bonding Chemistry Question

💡 Solution & Explanation

$XeF_4$ is $sp^3d^2$ hybridized with 2 lone pairs situated axially, leaving the 4 fluorines in a square planar geometry. $I_2Cl_6$ exists as a planar dimeric structure bridging via chlorine atoms. $CH_3^+$ is $sp^2$ hybridized, existing as a trigonal planar carbocation. $NH_3$ is $sp^3$ hybridized with 1 lone pair, creating a non-planar trigonal pyramidal shape.