Answer
CF2Cl2> CCl2H2 > CF2H2 > CCl4 > CH4
Work Step by Step
To rank molecules by polarity, we need to consider both bond polarity (difference in electronegativity) and molecular geometry (whether bond dipoles cancel or reinforce).
CF₂Cl₂: most polar due to highly electronegative F and Cl and asymmetric dipole arrangement.
CCl₂H₂: moderately polar, Cl more polar than H, geometry asymmetric.
CF₂H₂: somewhat polar, less than CCl₂H₂.
CH₄ and CCl₄: nonpolar, dipoles cancel completely.
The order from most to least polar is
CF2Cl2> CCl2H2 > CF2H2 > CCl4 > CH4.
This order is based on the electronegativity differences between the atoms in each molecule.
