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Give Plausible Explanation for Each of the Following: Why Do Primary Amines Have Higher Boiling Point than Tertiary Amines? - Chemistry

Give plausible explanation for each of the following:

Why do primary amines have higher boiling point than tertiary amines?

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Solution 1

In a molecule of tertiary amine, there are no H−atoms whereas in primary amines, two hydrogen atoms are present. Due to the presence of H−atoms, primary amines undergo extensive intermolecular H−bonding.

As a result, extra energy is required to separate the molecules of primary amines. Hence, primary amines have higher boiling points than tertiary amines.

Solution 2

Due to the presence of two H-atoms on N-atom of primary amines, they undergo extensive intermolecular H-bonding while tertiary amines due to the absence of H-atom on the N-atom do not undergo H-bonding. As a result, primary amines have higher boiling points than tertiary amines of comparable molecular mass.

Concept: Amines - Identification of Primary, Secondary and Tertiary Amines
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NCERT Class 12 Chemistry Textbook
Chapter 13 Amines
Q 14.2 | Page 402
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