Q.

The correct increasing bond angle among BF3, PF3 and ClF3 follow the order

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a

BF3 < PF3 < ClF3

b

PF3 < BF3 < ClF3

c

ClF3 < PF3 < BF3

d

All have equal bond angle

answer is C.

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Detailed Solution

In BF3, B is sp2 hybridized with bond angle 1200C.  In PF3, P is sp3 hybridized but bond angle is less than 109028 due to lone pair bond pair repulsion. In ClF3, Cl is sp3d hybridized having T-shape with bond angle 900C.
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