Which one of the following statements is correct?

Question

Accepted Answer

1. **Analyze Option A ($$BF_3$$):** $$BF_3$$ has a symmetrical trigonal planar geometry. The resultant of two B-F bond moments is equal and opposite to the third B-F bond moment, resulting in a net dipole moment of **zero** .
2. **Analyze Option B ($$NH_3$$ vs $$NF_3$$):** In $$NH_3$$, the orbital dipole due to the lone pair is in the same direction as the resultant of the three N-H bond moments, reinforcing the effect. In $$NF_3$$, the orbital dipole is in the direction opposite to the resultant of the three N-F bond moments. Consequently, the dipole moment of $$NH_3$$ (1.47 D) is **greater** than that of $$NF_3$$ (0.23 D) .
3. **Analyze Option C ($$CO_3^{2-}$$):** The carbonate ion is resonance stabilized. Experimental findings show all C-O bonds are equivalent. This is described by **three** equivalent canonical forms where the double bond is delocalized over the three oxygen atoms .
4. **Analyze Option D (Ozone):** The ozone molecule ($$O_3$$) is represented by **two** canonical forms (resonance structures) to explain the equality of its bond lengths .

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