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Question

PCl5 has a shape of trigonal bipyramidal whereas IF5 has a shape of square pyramidal, it is due to-

A
Presence of unshared electron pairs on I which is oriented so as to minimise repulsion while in PCl5 has no non-bonding pair.
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B
Octet of P is complete whereas that of I is incomplete.
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C
P and I belong to different group and period.
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D
Extent of different repulsion in F and I
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Solution

The correct option is A Presence of unshared electron pairs on I which is oriented so as to minimise repulsion while in PCl5 has no non-bonding pair.
PCl5 sp3d hybridised orbitals with no non-bonding pair (trigonal bipyramidal)

IF5 sp3d2 hybridised orbitals with one non bonding pair (square pyramidal)



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