JEE Chemistry 2025 Question with Solution

Given: We need the maximum covalency of a non-metallic group 15 element having the weakest $E-E$ bond.

Find: The correct option for the maximum covalency.

From the solution, the element identified is phosphorus among the non-metallic group 15 elements.

The extracted reasoning states that phosphorus has relatively weak $P-P$ bonding and, for this question, its practical observed maximum covalency is taken as $4$.

The solution explicitly concludes: The Correct Option is D.

Therefore, the maximum covalency is $4$, so the correct option is D.

Note: The solution contains internally inconsistent chemistry discussion because it also mentions phosphorus can show covalency $5$ in compounds like $PF_5$, but the source solution finally resolves the question to option D and value $4$.

Given: Group 15 non-metallic element with the weakest $E-E$ bond.

Find: Its maximum covalency.

The hint says that maximum covalency in group 15 depends on size and orbital availability, and it contrasts nitrogen with heavier elements like phosphorus.

The approach solution then identifies phosphorus as the relevant element for the question context and states that the practical observed maximum covalency is $4$.

Since option D corresponds to $4$, the answer is D.