Determine which of the molecules are polar. Explain your...

Determine which of the molecules are polar. Explain
your answers.
$$
\begin{array}{l}{\text { a. } \mathrm{CH}_{3} \mathrm{Cl}} \\ {\text { b. ClF }} \\ {\text { c. } \mathrm{NCl}_{3}} \\ {\text { d. } \mathrm{BF}_{3}} \\ {\text { e. } \mathrm{CS}_{2}}\end{array}
$$

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Key Concepts

Symmetry

Symmetry in molecules refers to the balanced arrangement of atoms around a central atom or axis, which can lead to the cancellation of individual bond dipoles. Even if bonds are polar, a symmetrical molecular structure might result in no net dipole moment, making the molecule nonpolar.

Molecular Polarity

Molecular polarity refers to the distribution of electrical charge over the atoms in a molecule, resulting in a net dipole moment. This concept is central in predicting physical properties like solubility and boiling points, where a molecule's polarity arises from both the polarity of its individual bonds and their spatial arrangement.

Electronegativity

Electronegativity is the measure of an atom’s tendency to attract electrons in a bond. Differences in electronegativity between bonded atoms create polar bonds, which are the fundamental units contributing to the overall molecular dipole when they do not cancel out due to molecular geometry.

Molecular Geometry

Molecular geometry describes the three-dimensional arrangement of atoms in a molecule as predicted by theories such as VSEPR (Valence Shell Electron Pair Repulsion). The shape of the molecule is crucial in determining whether the individual bond dipoles cancel out or produce an overall polar molecule.

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