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Chapter 29: Problem 6

The two monomers for the synthesis of nylon 6,6 are : [Main Jan. 12, 2019 (II)] (a) \(\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{NH}_{2}\) (b) \(\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{NH}_{2}\) (c) \(\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{NH}_{2}\) \text { (d) } \mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{NH}_{2}

Short Answer

Expert verified
The correct monomers are option (b): Adipic acid and hexamethylenediamine.

Step by step solution

01

Understand Nylon 6,6 Synthesis

Nylon 6,6 is synthesized through a condensation polymerization reaction, primarily involving two different types of monomers: hexamethylenediamine (a diamine) and adipic acid (a dicarboxylic acid).
02

Identify the Structure of Hexamethylenediamine

Hexamethylenediamine is characterized by having 6 carbon atoms in a straight chain, ending with amine groups. Its chemical structure is denoted as \(\mathrm{H}_2 \mathrm{~N}(\mathrm{CH}_2)_6 \mathrm{NH}_2\).
03

Identify the Structure of Adipic Acid

Adipic acid also has a straight chain of 6 carbon atoms, ending with carboxylic acid groups. It is represented as \(\mathrm{HOOC}(\mathrm{CH}_2)_4 \mathrm{COOH}\).
04

Match with Given Options

Among the choices, option (b) lists the correct monomers for nylon 6,6 as \(\mathrm{HOOC}(\mathrm{CH}_2)_6 \mathrm{COOH}\) and \(\mathrm{H}_2 \mathrm{~N}(\mathrm{CH}_2)_6 \mathrm{NH}_2\). This matches adipic acid and hexamethylenediamine.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Condensation Polymerization
Nylon 6,6 is created through a chemical process known as condensation polymerization. This type of polymerization involves the joining of monomers while simultaneously releasing small molecules as by-products, commonly water. The specific reaction we focus on here occurs between two monomers: hexamethylenediamine and adipic acid.

In the case of nylon 6,6, each molecule of hexamethylenediamine has two amine groups at each end, while each adipic acid molecule has two carboxylic groups. During the polymerization reaction, the amine group on the hexamethylenediamine reacts with the carboxylic group on the adipic acid. This reaction forms a strong amide bond and releases a molecule of water.

As this reaction repeats, long chains of nylon-6,6 are formed, characterized by the repeating pattern of -CO-(CH鈧�)鈧�-CO-NH-(CH鈧�)鈧�-NH-. This builds up into the strong material used in textiles and various other applications. Therefore, understanding condensation polymerization is crucial for grasping how such a versatile and durable material as nylon 6,6 is synthesized.
Hexamethylenediamine
Hexamethylenediamine is a key monomer used in the synthesis of nylon 6,6. Recognized by its chemical formula \( ext{H}_2 ext{N}( ext{CH}_2)_6 ext{NH}_2\), this compound comprises six carbon atoms forming a straight chain, flanked by amine (\

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Most popular questions from this chapter

Bakelite is obtained from phenol by reacting with: [Main Online April 25, 2013] (a) Acetal (b) \(\mathrm{CH}_{3} \mathrm{CHO}\) (c) \(\mathrm{HCHO}\) (d) Chlorobenzene

Which of the following statements about low density polythene is FALSE? [Main 2016] (a) Its synthesis requires dioxygen or a peroxide initiator as a catalyst. (b) It is used in the manufacture of buckets, dust-bins etc. (c) Its synthesis requires high pressure. (d) It is a poor conductor of electricity.

The correct functional group \(X\) and the reagent/reaction conditions \(Y\) in the following scheme are $$ [\mathbf{2 0 1 1}-\mathbf{I I}] $$$\mathrm{X}-\left(\mathrm{CH}_{2}\right)_{4}-\mathrm{X} \frac{\text { (i) } \mathrm{Y}}{\mathrm{HOOC}-\left(\mathrm{CH}_{2}\right)_{4}-\mathrm{COOH}, \text { heat }}{\longrightarrow}\( Condensation polymer (a) \)\mathrm{X}=\mathrm{COOCH}_{3}, \mathrm{Y}=\mathrm{H}_{2} / \mathrm{Ni} / \mathrm{heat}\( (b) \)\mathrm{X}=\mathrm{CONH}_{2}, \mathrm{Y}=\mathrm{H}_{2} / \mathrm{Ni} / \mathrm{heat}\( (c) \)\mathrm{X}=\mathrm{CONH}_{2}, \mathrm{Y}=\mathrm{Br}_{2} / \mathrm{NaOH}\( (d) \)\mathrm{X}=\mathrm{CN}, \mathrm{Y}=\mathrm{H}_{2} / \mathrm{Ni} / \mathrm{heat}$

Match the chemical substances in Column I with type of polymers/type of bonds in Column II. [2007]Column I Column II (A) Cellulose (p) Natural polymer (B) Nylon-6,6 (q) Synthetic polymer (C) Protein (r) Amide linkage (D) Sucrose (s) Glycoside linkage

Consider the Assertion and Reason given below. Assertion (A) : Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins. Reason (R) : High density polymers are closely packed and are chemically inert. [Main Sep. 06, 2020 (I)]Choose the correct answer from the following : (a) (A) is correct but \((\mathbf{R})\) is wrong. (b) Both (A) and \((\mathrm{R})\) are correct but \((\mathbf{R})\) is not the correct explanation of (A). (c) Both (A) and \((\mathrm{R})\) are correct but \((\mathrm{R})\) is the correct explanation of (A). (d) (A) and (R) both are wrong.
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