Page 41 - Practical-organic-3
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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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