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Assertion (A): Higher aliphatic amines are less soluble in water than lower aliphatic amines
Reason (R): Solubility of amines increases with increase in molecular mass of amines due to increase in size of hydrophobic alkyl part.

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is C.

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Detailed Solution

The amines are soluble in water due to the presence of high electronegative element nitrogen which can form hydrogen bonds with water molecules.

With increase in the molar mass of amines, tendency to form H-bonding and water repelling part (alkyl part) increases and this hydrophobic part decreases the solubility of amine in water.

Thus, the assertion is true but the reason is false. Hence, option (C) is correct.

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