Assertion: Sodium salt of butanoic acid on heating with soda lime gives butane.
Reason: Decarboxylation reaction yields alkanes having same number of carbon atoms as the parent acid.

Options

A. If both assertion and reson are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To solve this assertion-reason question, we need to analyze both the assertion and the reason provided.

### Step 1: Understanding the Assertion
The assertion states that "Sodium salt of butanoic acid on heating with soda lime gives butane."

- Butanoic acid has the formula CH₃CH₂CH₂COOH, which has four carbon atoms.
- When the sodium salt of butanoic acid (CH₃CH₂CH₂COONa) is heated with soda lime (a mixture of sodium hydroxide and calcium oxide), a decarboxylation reaction occurs.
- During decarboxylation, the carboxyl group (-COOH) is removed as carbon dioxide (CO₂), resulting in a hydrocarbon with one less carbon atom than the original acid.

### Step 2: Decarboxylation Reaction
In this case, the sodium salt of butanoic acid (C₄H₈O₂) will lose one carbon atom during the decarboxylation process:

- The reaction can be represented as:
\[ \text{CH}_3\text{CH}_2\text{CH}_2\text{COONa} \xrightarrow{\text{soda lime}} \text{C}_3\text{H}_8 + \text{Na}_2\text{CO}_3 \]

- The product formed is propane (C₃H₈), not butane (C₄H₁₀). Therefore, the assertion is **false**.

### Step 3: Understanding the Reason
The reason states that "Decarboxylation reaction yields alkanes having the same number of carbon atoms as the parent acid."

- This statement is also incorrect because, during decarboxylation, one carbon atom is removed from the parent acid.
- Thus, the product will have one less carbon atom than the original acid.

### Conclusion
Both the assertion and the reason are false.

### Final Answer
- Assertion: False
- Reason: False