We have a total of 14 valence electrons out of which 2 have to be placed between each of the atoms to form a chemical bond. The hydrogen atoms are always positioned at the outside and chlorine which is highly electronegative will go on the outside as well.įurther, we need to distribute these electrons in the structure. Now, by adding all the valence electrons we get a total of 14 valence electrons.Ĭarbon being the central atom remains at the center. As per the periodic table, carbon lies in group 14 and has 4 valence electrons, hydrogen belongs to group 1 and has only 1 valence electron and here, we have 3 hydrogen atoms.Ĭhlorine belongs to group 17 and has 7 valence electrons. Let’s learn the Lewis dot structure for CH3Cl.įor the Lewis structure, we need to calculate the total number of valence electrons for CH3Cl. If we look at the molecular geometry of the molecule, we can determine the polarity by drawing arrows of net dipole. When the structure is drawn, carbon is positioned at the center as the central atom with chlorine on one side and the hydrogen atoms on the other side. The absence of symmetry is due to the unequal sharing of valence electrons. If you consider Lewis structure for CH3Cl, you will find that it is an asymmetrical molecule. It also throws light on the physical properties of molecules.ĭetermining the arrangement of atoms and the distribution of electrons around it is important to predict the molecule’s shape and explain its characteristics. The Lewis structure is used to predict the properties of molecules and how they react with other molecules. Important reactions involving chloromethane Lewis electron-dot structure of CH3Cl The electronegativity of atoms sharing covalent bonds can be best understood by the Lewis structure and Valence Bond Theory. Polar molecules are those molecules that possess two ends, like two poles of a magnet, which vary completely in the nature of charge they carry.įor instance, in HCl ( Hydrogen Chloride) the chlorine exhibits higher electronegativity than hydrogen thereby strongly attracting electrons yielding a partial negative charge on itself and a partial positive charge on the other end, that is, on hydrogen. The C-Cl covalent bond shows unequal electronegativity because Cl is more electronegative than carbon causing a separation in charges that results in a net dipole. So, Is CH3Cl polar or non-polar? Yes, Methyl chloride (CH3Cl) or Chloromethane is a polar molecule. It involves the physical properties of the compounds such as boiling and melting points, solubility, surface tension and the interaction between the molecules. This is produced due to the difference in the electronegativity (the ability of an atom in a chemical bond to pull electrons towards itself) of two or more atoms in a molecule or in other words, the unequal sharing of their valence electrons. Polarity, as seen in compounds, is a condition where separation in electric charge results in the positive and negative pole of a compound.
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