N-butylamine (I), diethylamine (II) and N,N-dimethyl ethylamine(III) have the same molar mass. The increasing order of their boiling point is:

Question

N-butylamine (I), diethylamine (II) and N,N-dimethyl ethylamine(III) have the same molar mass. The increasing order of their boiling point is:

N-butylamine (I), diethylamine (II) and N,N-dimethyl ethylamine(III) have the same molar mass. The increasing order of their boiling point is:
A. III lt II lt I
B. I lt II lt III
C. III lt I lt II
D. II lt I lt III

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - A
Intermolecular H-bonding is more in primary amines than in secondary amines as there are two H-atoms available for H-bonding. Tertiary amines do not have intermolecular H-bonding due to absence of H-atoms. Therefore, the order of boiling points of the given amines is as follows `{:(nC_4H_9NH_2, gt , (C_2H_5)_2NH, gt , C_2H_5N(CH_3)_2),("bp=350.8 K", , "bp=329.3 K",,"bp=310.5 K"):}`