Consider the following compounds. Which compound possesses the highest dipole moment?

The total number of molecules with zero dipole moment among $CH_4$,$BF_3$,$H_2O$,$HF$,$NH_3$,$CO_2$,and $SO_2$ is $ . . . . . . $.

Give the correct order of initials $T$ or $F$ for the following statements. Use $T$ if the statement is true and $F$ if it is false.
$I. \, (CH_3)_2P(CF_3)_3$ is non-polar and $(CH_3)_3P(CF_3)_2$ is a polar molecule.
$II. \, CH_3 \widehat{P} CH_3$ bond angles are equal in the $(CH_3)_3P(CF_3)_2$ molecule.
$III. \, PF_3$ will be more soluble in a polar solvent than $SiF_4$.

The dipole moments of the given compounds are:

The dipole-dipole interaction energy between polar molecules in the solid state will be proportional to ...... [if $r$ denotes the distance between polar molecules]

Arrange the following compounds in increasing order of dipole moment:
$CH_3CH_2CH_3$,$CH_3CH_2NH_2$,$CH_3CH_2OH$