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Question

Nitrogen forms N2 but phosphorus is converted into P4 from P2. The reason for this is:

A
triple bond is present between phosphorus atoms.
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B
pπpπ bonding is weak.
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C
pπpπ bonding is strong.
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D
multiple bond is formed easily.
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Solution

The correct option is D pπpπ bonding is weak.
Due to larger atomic size P is unable to form pi bond and so it is tetra-atomic in which each P atom is linked with 3 other P atoms by 3 sigma bonds.

But, due to smaller atomic size N forms 1 sigma and 2 pi bonds i.e. triple bonds with other N atom and exists as diatomic molecules. Hence the bonding is responsible for that.

Phosporous form P4 because in P2 pπ-pπ bond is weaker.

Hence option B is correct.

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