Which among the following is an example of polar molecule?

• A: O₂
• B: H₂
• C: N₂
• D: HCl

Among the options provided, the example of a polar molecule is:

Identifying Polar Molecules

Polar molecules occur when there is an uneven distribution of electron density, leading to a dipole moment. This means one end of the molecule has a slight positive charge, while the other end has a slight negative charge.

Analysis of Options

• O₂ (Oxygen): Nonpolar, as it consists of two identical oxygen atoms sharing electrons equally.
• H₂ (Hydrogen): Nonpolar, due to equal sharing of electrons between two hydrogen atoms.
• N₂ (Nitrogen): Nonpolar, as it is made up of two nitrogen atoms with equal electronegativity.
• HCl (Hydrochloric Acid): Polar, because chlorine is more electronegative than hydrogen, creating a dipole moment.

Thus, the correct answer is HCl.