Question

which of the following molecules are polar? i. ch3f ii. brf5 iii. xef2 iv. sf4 o i and iii are polar molecules o i, ii and iv are polar molecules o ii and iv are polar molecules o i, ii, iii and iv are polar molecules o i and ii are polar molecules

Explanation:

Step1: Analyze CH₃F

CH₃F has a tetrahedral - like shape. Fluorine is highly electronegative. The bond dipoles do not cancel out, so it is polar.

Step2: Analyze BrF₅

BrF₅ has a square - pyramidal molecular geometry. The lone pair on bromine and the bond dipoles result in a non - zero net dipole moment, so it is polar.

Step3: Analyze XeF₂

XeF₂ has a linear molecular geometry. The bond dipoles cancel out due to the symmetry, so it is non - polar.

Step4: Analyze SF₄

SF₄ has a seesaw molecular geometry. The lone pair on sulfur and the bond dipoles lead to a non - zero net dipole moment, so it is polar.

Answer:

I, II and IV are polar molecules