Subjective Type

Account for the following: Although trimethylamine and n-propylamine have the same molecular weight, but the former boils at a lower temperature (276K) than the latter (322K). Explain why.

Solution

n-Propylamine has two H-atoms on the N-atom and hence undergoes intermolecular H-bonding, thereby raising its boiling point. Trimethylamine, $${({CH}_{3})}_{3}N$$, being a tertiary amine does not have any $$H-$$atom on the $$N-$$atom. As a result, it does not undergo H-bonding and hence its boiling point is low.

SIMILAR QUESTIONS

Organic Compounds Containing Nitrogen

The correct order of boiling points of the following isomeric amines is: $$C_4H_9NH_2.(C_2H_5)_2NH,\, C_2H_5N(CH_3)_2$$

Organic Compounds Containing Nitrogen

The decreasing order of boiling points of ethyldimethylamine, n- butylamine and diethylamine is n - Butylamine > Diethylamine > Ethyldimethylamine. This trend of the boiling point can be explained as:

Organic Compounds Containing Nitrogen

Give plausible explanation for each of the following: (i) Why are amines less acidic than alcohols of comparable molecular masses? (ii) Why do primary amines have higher boiling point than tertiary amines? (iii) Why are aliphatic amines stronger bases than aromatic amines?

Organic Compounds Containing Nitrogen

The correct order of boiling points of the following isomeric amines is: $$C_4H_9NH_2.(C_2H_5)_2NH,\, C_2H_5N(CH_3)_2$$

Organic Compounds Containing Nitrogen

The decreasing order of boiling points of ethyldimethylamine, n- butylamine and diethylamine is n - Butylamine > Diethylamine > Ethyldimethylamine. This trend of the boiling point can be explained as:

Organic Compounds Containing Nitrogen

Tertiary amines have lowest boiling points amongst isomeric amines because:

Organic Compounds Containing Nitrogen

Give plausible explanation for: Why do primary amines have higher boiling points than tertiary amines?

Organic Compounds Containing Nitrogen

Which of the following is/are correct?

Organic Compounds Containing Nitrogen

Give reasons for the following: Primary amines have higher boiling point than tertiary amines.

Organic Compounds Containing Nitrogen

Which of the following compounds has the lowest boiling point?

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