The structure of repeating unit in Nomex which is made from the given compounds has to be given. Concept introduction: In chemistry structure is the arrangement of chemical bonds between atoms in a molecule, specifically which atoms are chemically bonded to what other atoms with what kind of chemical bond. Carboxylic acid : One − O H group is attached to the carbonyl carbon atom of the compound. It is represented as R C O O H Amide: One − N H 2 , − N H R ' or − N R ' 2 group is attached to the carbonyl carbon atom of the compound. It is represented as R C O N R ' 2 . Amide Formation: Amide is formed when a carboxylic acid reacts with an amine or ammonia. Here, the − O H group is attached to the carbonyl carbon atom of the carboxylic acid is being replaced by − N H 2 , − N H R ' or − N R ' 2 group in the an amine or ammonia forming amide and water. Polyamide: One − C O O H group of a dicarboxylic acid reacts with the one of the amino groups of a diamine results in the formation of an amide between them. Repeated linking of more molecule results in the formation of a polymer with amide linkage called polyamide.

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Chapter 17.5, Problem 17.25P

Interpretation Introduction

Interpretation:

The structure of repeating unit in Nomex which is made from the given compounds has to be given.

Concept introduction:

In chemistry structure is the arrangement of chemical bonds between atoms in a molecule, specifically which atoms are chemically bonded to what other atoms with what kind of chemical bond.

Carboxylic acid: One −OH group is attached to the carbonyl carbon atom of the compound. It is represented as RCOOH

Amide: One −NH2, −NHR' or −NR'2 group is attached to the carbonyl carbon atom of the compound. It is represented as RCONR'2.

Amide Formation: Amide is formed when a carboxylic acid reacts with an amine or ammonia.

Here, the −OH group is attached to the carbonyl carbon atom of the carboxylic acid is being replaced by −NH2, −NHR' or −NR'2 group in the an amine or ammonia forming amide and water.

Polyamide: One −COOH group of a dicarboxylic acid reacts with the one of the amino groups of a diamine results in the formation of an amide between them. Repeated linking of more molecule results in the formation of a polymer with amide linkage called polyamide.

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