Question:
Which of the following molecule does not have zero dipole moment?
Which of the following molecule does not have zero dipole moment?
Show Hint
Lone pairs on a central atom usually result in a non-zero dipole moment if the structure is unsymmetrical.
Updated On: Apr 27, 2026
- Nitrogen trifluoride
- Boron trifluoride
- Carbon tetrachloride
- Beryllium difluoride
- Methane
Show Solution
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Symmetrical molecules ($BF_3$, $CCl_4$, $BeF_2$, $CH_4$) have zero net dipole moment.
Step 2: Meaning
$NF_3$ has a pyramidal shape due to the presence of a lone pair on Nitrogen.
Step 3: Analysis
The lone pair contribution does not cancel out the N-F bond dipoles entirely, resulting in a net dipole moment.
Step 4: Conclusion
Hence, correct answer is Nitrogen trifluoride.
Final Answer: (A)
Symmetrical molecules ($BF_3$, $CCl_4$, $BeF_2$, $CH_4$) have zero net dipole moment.
Step 2: Meaning
$NF_3$ has a pyramidal shape due to the presence of a lone pair on Nitrogen.
Step 3: Analysis
The lone pair contribution does not cancel out the N-F bond dipoles entirely, resulting in a net dipole moment.
Step 4: Conclusion
Hence, correct answer is Nitrogen trifluoride.
Final Answer: (A)
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