Which of the following trihalides of `P`is least acidic?A. `PI_(3)`B. `PBr_(3)`C. `PCl_(3)`D. `PF_(3)`

Which of the following trihalides of `P`is least acidic?A. `PI_(3)`B.

1.	Which of the following trihalides of `P`is least acidic?A. `PI_(3)`B. `PBr_(3)`C. `PCl_(3)`D. `PF_(3)`
Answer» Correct Answer - 1 The trihalides of `P, As` and `Sb` (esecially the fluorides and chlorides ) show acceptor porperties due to the presence of d-orbitals i.e. they can accept an electrons pair and can act as Lewis acids: `PF_(3)+F_(2)rarrPF_(5)` `PCl_(3)+Cl_(2)rarrPCl_(3)` `SbF_(3)+2F^(-)rarr[SbF_(5)]^(2-)` However, the Lewis acid strength decreases in the order: `PCl_(3) gt AsCl_(3) gt SbCl_(3)` (due to increasing size of `d` orbitals).`PF_(3) gt PCl_(3) gt PBr_(3) gt PI_(3)` (due to increasing siza of halogen).

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Which of the following trihalides of `P`is least acidic?A. `PI_(3)`B. `PBr_(3)`C. `PCl_(3)`D. `PF_(3)`

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