Answer to Question #92420 in Organic Chemistry for Tj

Question #92420
Using electronegativity values, determine bond polarities and the net dipoles in a molecule of PCl3 and indicate if the molecule will be polar.
1
Expert's answer
2019-08-12T07:39:35-0400

1) determine molecular geometry:

valence electrons = 5+7*3 =26

Lewis structure:



number of bonding pairs = 3

number of lone pairs =1

general formula AB3X

electron geometry - tetrahedral

molecular geometry- trigonal pyramidal

Bond angle <109.5



2) Electronegativity: P - 2.1, Cl - 3.0

Difference in electronegativities |2.1-3.0|=|-0.9|= 0.9 Covalent polar



The molecule is polar as bonds are polar and dipole moments do not cancel out, as molecule does not have right geometry (like tetrahedral or trigonal planar).


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