BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is a polar molecule with five polar bonds.
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It is a polar molecule with all bond polarities cancelled out each other.
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It is a symmetrical, non-polar molecule.
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It is an asymmetrical, non-polar molecule.
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Detailed explanation-1: -The correct answer is option b. I. The PF5 molecule has a trigonal bipyramidal geometry that makes the arrangement that opposite bonds cancel the dipole moment of each other. Phosphorus pentafluoride is a nonpolar molecule because of the symmetrical structure and even distribution of charges in the molecule.
Detailed explanation-2: -Phosphorus pentafluoride, PF5, is a phosphorus halide. It is a colourless, toxic gas that fumes in air.
Detailed explanation-3: -Considering the structure as shown in above image and hybridization of PCl5, we can say that it has both three fold axis of symmetry and two fold axis of symmetry.
Detailed explanation-4: -PF5 crystallizes in the hexagonal P6 3/mmc space group. The structure is zero-dimensional and consists of two phosphorus pentafluoride molecules. P5+ is bonded in a trigonal bipyramidal geometry to five F1-atoms. There is three shorter (1.56 Å) and two longer (1.61 Å) P–F bond length.