Question 73

In which of the following conversions involves change in both shape and hybridization?

Solution

In $$\text{BF}_3$$ boron is $$sp^2$$ and trigonal planar, while in $$\text{BF}_4^-$$ it is $$sp^3$$ and tetrahedral, so both change. In b and d the central atom stays $$sp^3$$ and only the shape changes, and in c carbon stays $$sp^3$$ and tetrahedral.

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