Question 11A.CQ.13: PCl5 is known but PI5 is not known. Why ?...
PCl_5 is known but PI_5 is not known. Why ?
Step-by-Step
Due to small size of Cl atom, five Cl atoms can be accommodated around P atom. But I is of large size and therefore, five I atoms cannot be accommodated around P atom. As a result, P–I bonds are weak and prefer to form PI_3 rather than PI_5. Therefore, PI_5 is unstable.
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