Question:

A primary amine has higher boiling point than any tertiary amine. A tertiary amine has greater number of $N - H$ bonds for $H$-bonding.

Updated On: Jul 28, 2022
  • If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:
  • If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:
  • If Assertion: is true but Reason: is false
  • If both Assertion: and Reason: are false
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The Correct Option is C

Solution and Explanation

Primary amines have two $N - H$ bonds, thus have the ability of $H$-bonding while such an ability is not found in tertiary amines because of the absence of $N - H$ bonds. Thus, primary amines have higher boiling point than tertiary amines having same molecular mass. Hence, Assertion is true but Reason is false.
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Concepts Used:

Structure of Amines

The structure of Amines is shown below:

Alkyl Amines:

Alkylamines consist of tetrahedral nitrogen centers where the C-N-H and C-N-C bond angle is 109°. The distance between C-N bonds is smaller in comparison to the C-C range. The amines can also display a chiral property wherein the center of the nitrogen atom holds for replacements which creates solo pairs.

The bond angle in the case of trimethylamine is 108° which results in the Pyramidal structure of trimethylamine-

Aromatic Amine:

Due to the mixture of the solo pair with the aryl substituent, nitrogen nearly has a planar structure in aromatic amines. The C-N range is very short. In aniline, the distance between C-N bonds is similar to the distance between C-C bonds.

Read More: Structure of Amines