PCl 5 has the shape of a trigonal bipyramidal where as I F 5 has the shape of square pyramidal. Explain.
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In PCl 5 there are 5 electron pairs around central phosphorus atom and all are bond pairs. The hybridisation of phosphorus is thus sp 3 d. To have minimum repulsions between bp-bp it acquires trigonal bipyramidal shape as shown below.
In IF 5 there are 6 electron pairs around central iodine atom. The hybridisation of iodine is thus sp 3 d 2 .
6 electron pairs contain 5 bond pairs and one lone pair so it will be square pyramidal to have minimum repulsions between lp-bp and bp-bp.
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