Question

pcl5 is reactive but sf6 is stable.Explain
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Answer 1

Answer:

Because phosphorous can  shows covalency of 5 and it has more polarising power that's why it is more covalent in nature and reactive whereas sf6 has octahedral structure it has highly stablised structure that why sf6 is stableExplanation:

Answer 2

PCl5 has two types of bonds. Axial bonds and equatorial bonds. The axial bonds pairs suffer more repulsion from equatorial bond pairs. So the axial bond length is greater than the equatorial bonds length.