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Nitrogen forms N2, but phosphorus is converted into P4 from P, the reason is

1. Triple bond is present between phosphorus atom
2. pπ–pπ bonding is strong
3. pπ–pπ bonding is weak
4. Multiple bond is formed easily

Correct answer: pπ–pπ bonding is weak

Solution

Nitrogen forms a triple bond due to strong pπ–pπ bonding, but in phosphorus, the larger atomic size weakens pπ–pπ bonding, favoring single bonds in a P4 tetrahedral structure.

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