Methods used for purification of organic compounds are based on :

Methods used for purification of organic compounds (such as distillation, crystallization, chromatography, etc.) depend on both the nature of the compound being purified and the type of impurities present.

For example, distillation is used when the compound and impurity have different boiling points, while crystallization depends on solubility differences. The choice of method depends on both factors.

The correct answer is Option 1: nature of compound and presence of impurity.