Identify the most soluble amine in water from the following amines having comparable molecular weight:

Primary amine

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Secondary amine

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Tertiary amine

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None of these

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Solution

The correct option is A Primary amine
The highest soluble amine would be primary amine, because it can form more H-bonds with water since $1^{\circ}$ amine $(- N H_{2})$ has $2$ hydrogen atoms for H-bonding which decreases as we move on to secondary and then tertiary amine. Hence, the correct answer is option (a).

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Similar questions

Give plausible explanation for each of the following:

(i) Why are amines less acidic than alcohols of comparable molecular masses?

(ii) Why do primary amines have higher boiling point than tertiary amines?

(iii) Why are aliphatic amines stronger bases than aromatic amines?

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