Degree of Unsaturation (DU)

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$$DU = \frac{2C + 2 - H - X + N}{2}$$

Where $$C$$ = carbon atoms, $$H$$ = hydrogen atoms, $$X$$ = halogen atoms, $$N$$ = nitrogen atoms. For a compound $$C_nH_m$$, $$DU = \frac{2n + 2 - m}{2}$$.

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