Assertion:-Aliphatic aldehyde can be diffrentiate from aromatic aldehyde by Fehling solution.
Reason:- This is because aliphatic aldehyde reduce fehling
solution but aromatic aldehyde donot.

Options

A. If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.
B. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion `&` Reason are False.

Answer

To solve the question, we need to analyze the assertion and reason provided:

**Assertion:** Aliphatic aldehyde can be differentiated from aromatic aldehyde by Fehling solution.

**Reason:** This is because aliphatic aldehyde reduces Fehling solution but aromatic aldehyde does not.

### Step-by-step Solution:

1. **Understanding Aldehydes:**
- Aliphatic aldehydes are those that do not contain an aromatic ring. Examples include CH3CHO (acetaldehyde) and CH3CH2CHO (propionaldehyde).
- Aromatic aldehydes contain an aromatic ring. An example is C6H5CHO (benzaldehyde).

**Hint:** Identify the structure of aliphatic and aromatic aldehydes to understand their differences.

2. **Fehling Solution Composition:**
- Fehling solution is an alkaline solution of copper(II) sulfate (CuSO4) mixed with sodium potassium tartrate (Rauschel salt). It is used to test for reducing sugars and aldehydes.

**Hint:** Remember that Fehling solution contains copper ions that can be reduced.

3. **Reaction of Aldehydes with Fehling Solution:**
- Aliphatic aldehydes act as strong reducing agents. When they react with Fehling solution, they reduce Cu²⁺ ions to Cu⁺ ions, forming a red precipitate of cuprous oxide (Cu2O).
- The reaction can be summarized as:
\[ RCHO + 2Cu^{2+} + 5OH^{-} \rightarrow RCOO^{-} + Cu_2O (s) + 3H_2O \]
- This results in a visible red precipitate, indicating the presence of an aliphatic aldehyde.

**Hint:** Focus on the reduction process and the formation of the red precipitate as a key indicator.

4. **Behavior of Aromatic Aldehydes:**
- Aromatic aldehydes do not reduce Fehling solution under the same conditions. This is primarily due to the stability of the aromatic ring, which makes them less reactive as reducing agents compared to aliphatic aldehydes.

**Hint:** Consider the stability of the aromatic ring and how it affects reactivity.

5. **Conclusion:**
- Both the assertion and the reason are true. The assertion correctly states that aliphatic aldehydes can be differentiated from aromatic aldehydes using Fehling solution, and the reason accurately explains that this is due to the ability of aliphatic aldehydes to reduce the solution while aromatic aldehydes cannot.

**Final Answer:** Both assertion and reason are true, and the reason is the correct explanation of the assertion.