Question

Identify the correct set of molecules with zero dipole moment.

• A. CO\(_2\), NH\(_3\), H\(_2\)O
• B. NH\(_3\), NF\(_3\), BF\(_3\)
• C. PF\(_3\), NH\(_3\), CH\(_4\)
• D. CH\(_4\), BF\(_3\), CO\(_2\)

Hint:

Symmetry of molecule dictates if dipole moment is zero or non-zero.

Answer 1

The Correct Option is D

Step 1: Molecular symmetry and dipole moment
- CH\(_4\): Tetrahedral, symmetrical, dipole moment zero.
- BF\(_3\): Trigonal planar, symmetrical, dipole moment zero.
- CO\(_2\): Linear, symmetrical, dipole moment zero.
- NH\(_3\), NF\(_3\), PF\(_3\): Pyramidal, polar molecules, non-zero dipole moments.
Step 2: Conclusion
Set (D) has molecules with zero dipole moments.