Question

Methods used for purification of organic compounds are based on :

• A. neither on nature of compound nor on the impurity present.
• B. nature of compound only.
• C. nature of compound and presence of impurity.
• D. presence of impurity only.

Answer 1

The Correct Option is C

To determine the methods used for the purification of organic compounds, we must consider the nature of the compound and the presence of impurities, as both factors critically influence the choice of purification technique. Below is a detailed explanation of how both these factors play a role:

1. Nature of the Compound:
   • Organic compounds can have vastly different physical properties such as boiling point, solubility, and volatility. Understanding these properties is crucial in selecting an appropriate purification method.
   • For example, if the compound is volatile, distillation would be an appropriate method. If the compound is non-volatile and solid at room temperature, recrystallization might be used.
2. Presence of Impurity:
   • The type and nature of impurities present also determine which purification method to select. Impurities may be volatile or non-volatile, soluble or insoluble, etc.
   • For instance, if the impurity is non-volatile and remains as residue, simple distillation might effectively purify the volatile organic substance.

Thus, based on these factors, the most comprehensive purification approach considers both the nature of the compound and the presence of impurities. The correct answer, accordingly, is:

The methods used for purification of organic compounds are based on the nature of the compound and presence of impurity.

Answer 2

Organic compounds are purified based on:

• The nature of the compound (e.g., solubility, boiling/melting point, volatility, etc.).
• The nature of the impurity present (e.g., soluble or insoluble, volatile or non-volatile, etc.).

Thus, purification methods such as crystallization, distillation, chromatography, and sublimation are chosen based on the combination of the compound’s properties and the impurities involved.

Final Answer is Option (3).