which is the incorrect about bond angles ?
(1) NH3 > NF3
(2) NF3 > PF3
(3) NH3 > PH3
(4) NH3 > H2O
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(2) The bond angle in PF3 is greater than NF3 because in PF3 back bonding is present. Due to which lp-bp repulsion becomes weaker.
PF3 are also pyramidal in shape with one lone pair on P. But PF3 has greater bond angle than PH3 (opposite to NH3 and NF3). This is due to resonance in PF3, leading to partial double bond character as shown below P F F F +