In how many of the following compounds the bond angles are more than expected due to delocalization of lone pair electrons according to VSEPR theory $P F_{3}, O C l_{2}, S F_{2}, O F_{2}, N {(S i H_{3})}_{3}, {(S i H_{3})}_{2} O, N {(C H_{3})}_{3}, C H_{3} O C H_{3}$

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answer is 4.

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Detailed Solution

In $P F_{3}, O C l_{2}, N {(S i H_{3})}_{3} a n d {(S i H_{3})}_{2} O$ , the lone pairs delocalize in to the vacant d-orbital of the surrounding atom in bond. Due to this reason the bond will get double bond character and the effect of double bond character and the effect of lone pair at central atom decreases. So the bond angles increases than expected