Stability of pentahalides is in order :

P > Sb > As > Bi for given X.

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F > CI > Br for given element

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Both (A) and (B)

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None of the above

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Solution

The correct option is C Both (A) and (B)
Due to inert pair effect, as we move down the group stability of pentahalides decreases. So order is P > Sb > As > Bi for given X and F > CI > Br for given element because as size of halide increases, steric hinderance increases and molecule become unstable.

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