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Question

The correct increasing bond angle among BF3, PF3 and CIF3 follows the order

A
BF3<PF3<CIF3
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B
PF3<BF3<CIF3
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C
CIF3<PF3<BF3
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D
BF3=PF3=CIF3
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Solution

The correct option is C CIF3<PF3<BF3
The bond angle in BF3 is 120 since B is sp2 - hybridized. In PF3, P is sp3 - hybridized but the bond angle is little less that 109.28 (but far greater than 90) due to bond pair - lone pair repulsion. In CIF3, Cl is sp3 d hybridized. It has T - shape and hence the bond angle is around 90. Therefore the correct order of increasing bond angle is CIF3<PF3<BF3

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