Q.

The bond angle in PH3 is less than the bond angle in PF3. This is due to

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a

Increases bond pair - bond pair repulsions due to multiple bond

b

Both (a) and (b) 

c

Enhanced replulsions due to the presence of double bond in PF3

d

Displacement of electron could in P-F bond towards F in PF3

answer is C.

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Detailed Solution

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Increase electron density in P-F bonds results increased bp-bp repulsions so higher bond angle.

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