Answer :
the correct statement is that a phosphorus-nitrogen bond is polar, with the nitrogen end having a partial negative charge.
The correct answer is:
4. polar, with the nitrogen end having a partial negative charge.
In a phosphorus-nitrogen (P-N) bond, the nitrogen atom is more electronegative than the phosphorus atom. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. Due to the difference in electronegativity between phosphorus and nitrogen, the shared electron pair in the P-N bond is shifted closer to the nitrogen atom.
As a result, the nitrogen atom in the P-N bond will acquire a partial negative charge, while the phosphorus atom will have a partial positive charge. This charge separation creates a polar bond, with the nitrogen end being partially negative (due to the higher electronegativity) and the phosphorus end being partially positive.
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