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InterviewSolution
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Which of the following trihalides has the maximum bond angle?A. `PI_(3)`B. `PBr_(3)`C. `PCl_(3)`D. `PF_(3)` |
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Answer» Correct Answer - 4 Like ammonia, trihalides have pyramidal shapes, i.e. the central atom is `sp^(3)` hybridized. There of the four `sp^(3)`-orbitals from `sigma`-bonds with halgon atoms while the fourth `sp^(3)`-orbital contains the lone pair of electrons. The bond angles of the trihalides of an element decrease as the electronegativity of the halogen increasese, i.e. `underset((96.3^(@)))(PF_(3)) lt underset((100.4^(@)))(PCl_(3)) lt underset((101^(@)))(PBr_(3)) lt underset((102^(@)))(PI_(3))` As the electronegativity of halgen increases , the bond pairs move away from the central `P` atom. As a result lone pairs -bond hair replusions increase while bond pair-bond pair repulsions decreases .Consequently the bond angles increase. |
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