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Trimethyl amine oxide and trimethyl phosphine oxide can be represented as (CH_3)_3N^(+)-O^(-) , (CH_3)_3P^(+)-O^(-) Answer the following questions based on these Triphenyl Phosphine oxide can be respectively by two canonical forms but trimethyl amine oxide can't be (CH_3)_3P^(+) - O^(-) harr (CH_3)_(3)P=O It is due to

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Phosphorus ACCEPTS charge density from oxygen and accomodates it in its vacant d - orbitals
NITROGEN does not POSSES d - orbitals and thus can't FORM the `pi` - bonded structure
Both (a) and (B)
None forms canonical forms

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