Question

Which of the following molecules has "NON ZERO" dipole moment value?

• A. CCl₄
• B. HI
• C. CO₂
• D. BF₃

Answer 1

The Correct Option is B

The question requires identifying the molecule with a non-zero dipole moment among the given options. Let's analyze each molecule to determine the correct answer:

1. CCl₄: Carbon tetrachloride is a symmetrical molecule with a tetrahedral geometry. This symmetry causes the dipole moments of the polar C-Cl bonds to cancel each other out. Hence, CCl₄ has a dipole moment of zero.
2. HI: Hydrogen iodide is a diatomic molecule with a polar covalent bond between hydrogen and iodine. Due to the electronegativity difference between hydrogen and iodine, the molecule has a non-zero dipole moment. Thus, HI has a non-zero dipole moment value.
3. CO₂: Carbon dioxide is a linear molecule, where the two polar C=O bonds are arranged symmetrically. This symmetry leads to the cancellation of dipole moments, resulting in a net dipole moment of zero.
4. BF₃: Boron trifluoride has a trigonal planar geometry. The three B-F bonds are symmetric and polar, yet their dipole moments cancel out due to the molecule's symmetry. Hence, BF₃ has a dipole moment of zero.

Therefore, the only molecule in the given options with a non-zero dipole moment is HI.