Viscosity data were measured at 298.15 K and 308.15 K for formamide + 1-propanol, 2-propanol, 1-butanol, 2-methyl-1-propanol or 2-methyl-2-propanol mixtures. For an equimolar mixture, deviation in viscosity follows the sequence: 2-methyl-2-propanol >2-methyl-1-propanol>1-butanol>2-propanol>1-propanol. The viscosity data were further analyzed in terms of graph theory. Free energy of activation was also calculated from experimental viscosity data along with previously reported excess volume data. The deviation in viscosity and free energy of activation were fitted to Redlich-Kister polynomial equation. The viscosity data were also correlated by correlations like Grunberg-Nissan, Tamura-Kurata, Hind- McLaughlin-Ubbelohde, and Katti-Chaudhari relation. Various adjustable parameters, G12, T12, H12, and Wvis/RT, of various correlations were used to predict viscosity deviation of binary mixtures. Positive value of G12 indicates strong interaction in the studied systems. Grunberg-Nissan relation has lowest deviation among the four correlations for formamide+ 1-propanol or 2-propanol mixtures; and for mixtures of formamide with 1-butanol or 2-methyl- 1-propanol, Tamura- Kurata has lowest deviation. Grunberg-Nissan gives lowest deviation for formamide + 2-methyl -2-propanol mixtures.
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