The order of boiling point of the following amines is (i) Butan-1-amine (ii) N-Ethylethanamine (iii) N,N-Dimethylethanamine
(i) > (ii) > (iii)
All three are isomers of formula \(\mathrm{C_4H_{11}N}\), so boiling point depends on intermolecular hydrogen bonding.
Butan-1-amine (primary) has two N-H hydrogens and forms the most hydrogen bonds.
N-Ethylethanamine (secondary) has one N-H hydrogen, so it forms fewer hydrogen bonds.
N,N-Dimethylethanamine (tertiary) has no N-H hydrogen and cannot form hydrogen bonds between its molecules.
Hence, (i) > (ii) > (iii).
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