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Question

If the π-back bonding involves the lone pair of central atom, then bond angle gets opened up due to

A
increase of bp/bp repulsion for the enhanced bond multiplicity
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B
decrease of lp/lp and lp/lp repulsion(s) on the central atom
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C
both (a) and (b)
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D
none of these
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Solution

The correct option is C both (a) and (b)
If the π-back bonding involves the lone pair of central atom, then bond angle gets opened up due to :
(a) increase of bp/bp repulsion for the enhanced bond multiplicity
(b) decrease of lp/lp and lp/bp repulsion(s) on the central atom
As the repulsion between lone pair and bond pair decreases and the repulsion between bond pair and bond pair increases, the bond angle increases.

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