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Fractional distillation is used for liquids with close boiling points (< 25°C difference), like 78°C and 82°C.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Purification Methods - Crystallization Distillation Chromatography
Sublimation is for solids, not liquids. Simple distillation (40°C difference) or differential extraction (solubility) would work, but sublimation is irrelevant.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism
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