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Isobutanol and methanol do not form an azeotrope. An azeotrope is a mixture of two or more liquids that has a constant boiling point and composition. To form an azeotrope, the intermolecular forces between the components must be significantly different from those in the pure liquids. Isobutanol and methanol are both alcohols, and their intermolecular forces are quite similar. Therefore, they are unlikely to form an azeotrope.