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Question

If the π-back bonding involves the vacant orbital of the central atom, then the bond angle gets widened due to :

A
the increased bp/bp repulsion for the enhanched bond multiplicity
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B
the decreased of lp/bp repulsion(s)
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C
both (a) and (b)
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D
None of the above
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Solution

The correct option is A the increased bp/bp repulsion for the enhanched bond multiplicity
When, th vacant orbital of the central atom s involved in the pi back bonding, the repulsion between bond pair and bond pair increases as the bond multiplicity increases and the lone pair bond pair repulsion decreases. Hence, the bond angle widens.

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