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  4. Arrange the following molecules from most to least polar. CH4 CF2Cl2 CF2H2 CCl4 CH2Cl2 I II III IV V

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Q. Arrange the following molecules from most to least polar.

$CH_4$ $CF_2Cl_2$ $CF_2H_2$ $CCl_4$ $CH_2Cl_2$
I II III IV V

NTA AbhyasNTA Abhyas 2020Chemical Bonding and Molecular Structure

Solution:

(i) $\text{lnC}\text{H}_{4}$ and $\text{CC}\text{l}_{4}$ being tetrahedral (symmetrical molecules), bond dipoles cancel one other resulting in zero dipole moment.

(ii) As electronegativity difference between two bonded atoms increases, the bond polarity increases resulting into the increase in dipole moment.