Question

Among the following isomeric amines, an amine having the highest boiling point is

• A. Diethylamine
• B. n-Butylamine
• C. tert-Butylamine
• D. Ethyldimethylamine

Hint:

Branching lowers boiling point due to reduced surface contact.

Answer 1

The Correct Option is B

Step 1: Understand factors affecting boiling point.
Boiling point depends on intermolecular hydrogen bonding and surface area of molecules.
Step 2: Analyze the given amines.
Primary amines form stronger hydrogen bonds than secondary and tertiary amines. Straight-chain amines have higher boiling points than branched ones.
Step 3: Comparison.
n-Butylamine is a primary, straight-chain amine, hence shows maximum hydrogen bonding and higher boiling point.
Step 4: Conclusion.
Therefore, n-butylamine has the highest boiling point.