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Anomalous Behaviour of Fluorine

The decreasin...

Question

The decreasing order of Lewis acid strength of trihalides of 15th group elements is ________.

P C l_{3} > P F_{3} > P B r_{3} > P I_{3}

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P F_{3} > P C l_{3} > P B r_{3} > P I_{3}

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P I_{3} > P B r_{3} > P C l_{3} > P F_{3}

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P I_{3} > P B r_{3} > P F_{3} > P C l_{3}

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Solution

The correct option is B $P F_{3} > P C l_{3} > P B r_{3} > P I_{3}$
The Lewis acid strength increases with increase with increase in electronegativity of the halogen.
Hence the order $P F_{3} > P C l_{3} > P B r_{3} > P I_{3}$ .

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