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Question

Trimethylamine oxide and trimethyl phosphine oxide can be represented as :

(CH3)3+N−O−(CH3)3+P−O−
(I) (II)

Select the correct structure.

A
(CH3)3N=O
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B
(CH3)3P=O
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C
Both (A) and (B)
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D
None of these
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Solution

The correct option is A (CH3)3P=O
Due to the absence of vacant d-orbitals, N is unable to expand its valency beyond 4 but P can expand its valency due to the presence of d-orbitals.

The correct structure is - (CH3)3P=O.

So, option B is correct.

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