Question

Which of the following are non-planar molecules?

• A. $F_{2}C=C={CF}_2$
• B. $F_{2}B-C\equiv C-{BF}_4$
• C. $N_2{Cl}_4$
• D. ${SF}_6$

Answer 1

Answer: (A), (C), (D)

$N_2{Cl}_4$
$F_{2}C=C={CF}_2$
${SF}_6$

Option A is an example of an allene. This are typically non-planar, as the p orbitals forming the individual pi bonds are in different planes in these molecules.

$N_2(Cl{)}_4$: It will rotate on the $N-N$ single bond to maximize the distance between the chlorine atoms. The individual $N-Cl$ bond dipole moments are small, which leads to a small net dipole moment for the molecule.

$S{F}_6$ : It has octahedral geometry.