Question

which of the following molecules are polar? i. ash3 ii. sbf5 iii. sf4 iv. ch4 ii and iv are polar i, iii and iv are polar ii, iii and iv are polar i and ii are polar i and iii are polar

Explanation:

1. For \(AsH_3\): It has a trigonal - pyramidal molecular geometry due to the presence of a lone pair on the central \(As\) atom. The bond dipoles do not cancel out, making it polar.
2. For \(SbF_5\): It has a trigonal - bipyramidal molecular geometry with no lone pairs on the central \(Sb\) atom. The bond dipoles cancel out, so it is non - polar.
3. For \(SF_4\): It has a seesaw molecular geometry due to the presence of a lone pair on the central \(S\) atom. The bond dipoles do not cancel out, making it polar.
4. For \(CH_4\): It has a tetrahedral molecular geometry with no lone pairs on the central \(C\) atom. The bond dipoles cancel out, so it is non - polar.

Answer:

E. I and III are polar