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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn141

Which of the following statements about gaseous $PCl X_{5}$ is/are correct?

AThe molecule is trigonal bipyramidal.
BThe hybridisation of phosphorus is $s p^{3} d$ .
CThe two axial P-Cl bonds are longer than the three equatorial P-Cl bonds.
DAll five P-Cl bond lengths are identical.

Answer: A, B, C

Five bond pairs and no lone pair give a trigonal bipyramid with sp3d hybridisation. Axial bonds repel three equatorial pairs at 90 degrees, so they are longer and weaker (about 219 pm versus 202 pm). Hence the bonds are not all equal.

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