STANDARDChemistry-Organic Chemistry
STANDARD Chemistry Amines MCQ Question
Type: MCQ-conceptual-Medium
Which of the following should be most volatile? (I) CH₃CH₂CH₂NH₂ (II) (CH₃)₃N (III) CH₃CH₂NHCH₃ (IV) CH₃CH₂CH₃
A
II
B
IV
C
I
D
III
Correct Answer
Option B
Detailed Explanation
The order of boiling points of isomeric amines is 1° amines > 2° amines > 3° amines. Because of absence of H-atom available for hydrogen bonding, 3° amines do not have intermolecular association. Intermolecular association is more in 1° amines than in 2° amines as there are two H-atoms available for H-bonding. Hydrocarbons are almost non-polar molecules and possess weak van der Waals forces and hence has lowest boiling point i.e., most volatile.
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