The Question is from neet-chemistry , and it was created by the author THIRUPATHI REDDY

Question

The best method for the separation of naphthalene and benzoic acid from their mixture is

THIRUPATHI REDDY · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Separation of organic compounds based on physical properties.
	**Related Topics**: Solubility, Crystallization, Sublimation, Distillation, Chromatography
	**Prerequisites**: Understanding of different separation techniques and their applicability.
## SOLUTION PATHWAY
**Given Information**:
	* Mixture of naphthalene and benzoic acid.
	* Need to choose the best separation method.

**Method & Steps**:
	1. Identify the properties: Naphthalene is a non-polar compound, while benzoic acid is a polar compound with a carboxylic acid group.
		Reasoning: Different polarities influence their solubilities in different solvents and behaviors during separation.
	2. Evaluate separation methods:
		* **Chromatography:** Suitable for separating complex mixtures but not the most efficient for this particular case.
		* **Crystallisation:** Exploits differences in solubility based on temperature. Benzoic acid is more soluble in hot solvents, while naphthalene is less soluble in common solvents at lower temperatures. This method is efficient for separating compounds with differing solubilities.
		* **Distillation:** Not suitable as both naphthalene and benzoic acid have high boiling points and would likely decompose before boiling.
		* **Sublimation:** Naphthalene sublimes, but benzoic acid does not. While this works for separating pure naphthalene, it is not the best method for separating *both* from the mixture.
	3. Select the best method: Crystallisation is the most suitable method because it exploits the difference in solubility between the two compounds.
		Result: Crystallisation will allow for the effective separation of naphthalene and benzoic acid.

## OPTION ANALYSIS
[A] :x: Chromatography is a separation technique that uses differential partitioning between a stationary phase and a mobile phase. It is not the most efficient method for separating these two compounds. 
[B] ✓: Crystallisation is a suitable method because benzoic acid and naphthalene have different solubilities in common solvents, allowing them to be separated by controlled cooling and precipitation. 
[C] :x: Distillation is used to separate liquids with different boiling points. Both benzoic acid and naphthalene are solids and would not be separated by distillation.
[D] :x: Sublimation could be used to isolate naphthalene, but would not separate benzoic acid. Therefore, it's not the best method for separating *both* from the mixture.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Choosing sublimation: Forgetting that sublimation is effective for *one* compound, not the mixture.
		2. Misunderstanding solubility differences: Not considering that both compounds have different solubility behaviours.
	**Quick Tips**:
		1. Crystallisation is a powerful separation technique for compounds with different solubilities.
		2. Distillation is for liquids with different boiling points, and sublimation is for solids that can transition directly to the gas phase.

THIRUPATHI REDDY · Answer

Chromatography

THIRUPATHI REDDY · Answer

The correct Option is "Crystallisation"

THIRUPATHI REDDY · Answer

Distillation

THIRUPATHI REDDY · Answer

Sublimation

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