Important Talent Search Exams

Allen TALLENTEX 2018 (Class 5 to 11)
Aakash ANTHE 2017 : 100% Scholarship (Class 8, 9, 10)


Evidences show that nitrogen is attached to one of the oxygen atoms by a double bond and to the other by a dative bond. The resonance hybrid is shown as under which confirms the spectroscopic evidence that both nitrogen – oxygen bonds have same bond length.

Out of three sp2 hybrid orbitals of nitrogen one overlaps with alkyl group and two with oxygens while the unhybridized p orbital of N – atom containing a pair of electrons and lying perpendicular to the plane of hybrid orbitals overlaps sideway with half filled 2 p – orbitals of two oxygen atoms.

This forms π- bond above and below the plane of molecule.

Illustration 1. p-chloronitrobenzene has less dipole moment (2.4D) than p-nitrotoluene. Explain.


In p – chloronitrobenzene, the two vector dipole moment act opposite to each other which partially cancel each other. On the other hand, in p – nitro toluene, the two vectors acts in the same direction to give additive dipole resultant.

« Click Here for Previous Topic Click Here for Next Topic »

CBSE Class 12 Chemistry Amines All Topic Notes CBSE Class 12 Chemistry All Chapters Notes




Please enter your comment!
Please enter your name here