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System                          Coupling Constant (J)                    Type of protons

                                    a.  Ha  peak  will  appear  as  doublet  (db)  with

                                       ortho coupling only with Hb,
                                    b.  Hb  peak  will  appear  as  doublet  of  doublet
             1,2,4-substituted
             Aromatic system           (dd)  with  ortho  coupling  with  Ha  &  meta
                                       coupling with Hc.
                                    c.  Hc peak will appear as doublet (db) with meta
                                       coupling with Hb.



                                 c        a
                                                                                        b

































































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