Which of the following is NOT a characteristic of amines?

Amines are a class of organic compounds characterized by the presence of one or more nitrogen atoms connected to carbon atoms. They can exhibit various physical and chemical properties, including those mentioned in the options provided.

The assertion that amines typically form carboxylic acids is not accurate. While amines can be involved in reactions that may lead to the formation of carboxylic acids, this is not a direct characteristic of amines themselves. Instead, amines are more commonly recognized for their basicity and ability to accept protons, as well as their distinctive odors, which often resemble that of fish.

The characteristics that do apply to amines include the presence of a nitrogen atom, which is fundamental to their structure, the characteristic fishy odor associated with many amines, and their behavior as bases in chemical reactions, which is a significant aspect of their chemistry. Thus, the correct response identifies an option that does not align with the defining traits of amines.