Degree of unsaturation or index of hydrogen deficiency (IHD) Used to determine number of rings or double bonds from a molecular formula Double bond = 1 IHD Triple bond = 2 IHD Ring = 1 IHD Aromatic = 4 IHD (3 double bond + 1 ring) For the generic formula … Continue reading 11.3 Spectroscopic identification of organic compounds

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