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While discussing about dipole moment of the compounds, our chemistry teacher told that the dipole moment will be 0 for 1,4-Dichlorobenzen, and for those compounds where same atoms or group of atoms are attached in para position if the hybridization of the atom of the group which is directly attached to the carbon of the benzene ring is sp or sp2 but if it is not the case i.e if OH is attached at para positions then the dipole moment wont be 0. I want to know if there is any reason or are they just unexplained examples. Are there more such exceptions? Please check the picture for examples.enter image description here

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    $\begingroup$ Yes there is a reason, symmetry. $\endgroup$ – Avnish Kabaj Feb 4 '18 at 12:26
  • $\begingroup$ No but if the copound is oh instead of no2 the hybridisation will be sp3 and dipole moment wont be 0 $\endgroup$ – Jasmine Feb 4 '18 at 13:22
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    $\begingroup$ Exactly, because it won't be symmetrical. Is the OH going to be linear? $\endgroup$ – Avnish Kabaj Feb 4 '18 at 13:23
  • $\begingroup$ Ok then why true for no2. It has lone pairs more towards doubly bonded oxygen $\endgroup$ – Jasmine Feb 4 '18 at 13:25
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    $\begingroup$ Resonance, both the oxygens are the same $\endgroup$ – Avnish Kabaj Feb 4 '18 at 13:30

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