Explain why the dipole moment of chlorobenzene is lower than cyclohexyl chloride ?

There are two major aspects that can explain this :-

  1. The C-Cl bond in case of chlorobenzene is having some double bond like character , which is indicated by its shorter bond length. thus it indicates the back-flow of electrons from the Chlorine to the Carbon. Thus the polarity decreases and it shows non polar character.

2. The Carbon atom shows different electronegativities on the basis of its hybridisation. The electronegativities follow the following sequence:-

sp > Sp2 > sp3

As in this case we have the chlorobenzene which is having Sp2 hybrid carbon that is more electronegative than sp3 hybrid carbon atom in cyclohexyl chloride. and due to this the carbon of chlorobenzene has a good hold on the electron and so it shows non polar behaviour in case of chlorobenzene.

Published by Ankush Sharma

I am M.Sc (chemistry ) from Punjabi University Patiala. I am a science teacher with expertise in chemistry, with 8 years of experience in teaching. Writing and blogging is my hobby, I write whenever I am free. I am constantly working on creating a new and easy way of learning the tough things in an effective way. I am constantly working to make authentic and reliable information to be shared with my students and widen the horizons of knowledge.

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