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Question

For which of the following molecules pπpπ bonding is not possible under ordinary conditions.
Nitrogen, Phosphorus, Arsenic and Antimony.

A
Nitrogen, Phosphorus
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B
Phosphorus, arsenic and antimony
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C
Nitrogen and antimony
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D
only phosphorus and arsenic
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Solution

The correct option is B Phosphorus, arsenic and antimony
The given elements belong to the nitrogen family.
In the case of N2, Nitrogen forms pπpπ multiple bonds.
NN
1 bond is sigma and the remaining 2 bonds are pπpπ bonds.

Other elements of group 15 do not form pπpπ multiple bonds under normal conditions, because of the repulsions between the non-bonded electrons of the inner orbitals. Size also plays a role here.

There is no such repulsion in nitrogen atoms because of its small size and they have only 1s2 electrons in their inner orbital and hence, their p orbitals easily overlap to form pπpπ multiple bonds.

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