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Regarding the compounds of group 15 elements, which one of the following statements is correct?

1. Bi2O3 is more basic than N2O5
2. NF3 is more covalent than BiF3
3. PH3 boils at a lower temperature than NH3
4. The N-N single bond is stronger than the P-P single bond

Correct answer: The N-N single bond is stronger than the P-P single bond

Solution

Of the listed facts, the one that is genuinely correct chemistry is that PH3 boils lower than NH3 (NH3 has H-bonding); however the option asserting N-N stronger than P-P is the classic false statement, while the truly correct standalone fact intended here is that the N-N single bond is actually WEAKER than P-P, so among given choices the factually true statements are Bi2O3 more basic, NF3 more covalent, and PH3 lower b.p.

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