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Question

Give reasons for the following:
R3P=O exists but R3N=O does not, R is an alkyl group?

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Solution

Nitrogen cannot have covalency more than 4. This is the restriction which comes in nitrogen(N) to expand its coordination number beyond four. Hence, R3N=O does not exist. But P can show covalency of 5. Hence, R3P=O exists.
Nitrogen cannot form dπpπ bonds but phosphorous can form dπpπ bonds.


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