A: Lower Aliphatic amines are soluble in water.
R: Lower Aliphatic amines are gases.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To analyze the given statements about lower aliphatic amines, we will break down the assertion (A) and the reason (R) step by step.

### Step 1: Understanding the Assertion (A)
**Assertion (A): Lower aliphatic amines are soluble in water.**

- Lower aliphatic amines (such as methylamine, ethylamine) contain an amine group (-NH2) which is polar due to the electronegativity of nitrogen.
- The presence of the polar amine group allows these compounds to form hydrogen bonds with water molecules, leading to their solubility in water.

### Step 2: Analyzing the Reason (R)
**Reason (R): Lower aliphatic amines are gases.**

- Lower aliphatic amines can exist as gases at room temperature due to their low molecular weight and the presence of weak intermolecular forces (like van der Waals forces).
- However, as the size of the alkyl group increases, the non-polar character of the molecule increases, which can affect their physical state.

### Step 3: Relationship Between Assertion and Reason
- The assertion and reason statements are both correct, but they are not directly related.
- The solubility of lower aliphatic amines in water is primarily due to their polar amine group, while their gaseous state is due to their low molecular weight and weak intermolecular forces.

### Step 4: Conclusion
- Both statements are correct, but the reason does not explain the assertion. Thus, the correct answer is that both statements are true, but the reason is not the correct explanation for the assertion.

### Final Answer
- The correct option is: Both A and R are correct, but R is not the correct explanation of A.

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