Question

Which of the following is not used as a parameter for the classification of polymers?

• A. Source of polymer
• B. Structure of polymer chain
• C. Mode of polymerization
• D. Boiling point of monomer

Hint:

Common bases for classification of polymers:
• Source of polymer
• Structure of polymer chain
• Mode of polymerization
• Molecular forces (thermoplastics, thermosetting polymers, elastomers, fibres) Physical properties like boiling point or melting point of monomers are not used for polymer classification.

Answer 1

The Correct Option is D

Concept: Polymers are commonly classified based on several important parameters related to their origin, structure, and method of formation. These classifications help chemists understand the properties and applications of different polymers. The common parameters used for classification of polymers include:
• Source of polymer
• Structure of polymer chain
• Mode of polymerization However, physical properties of monomers such as their boiling point are not used as a criterion for polymer classification.

Step 1: Classification based on source. Polymers can be classified based on their source as:
• Natural polymers (e.g., cellulose, proteins)
• Semi-synthetic polymers (e.g., cellulose acetate)
• Synthetic polymers (e.g., nylon, polyethylene) Thus, source of polymer is a valid classification parameter.

Step 2: Classification based on structure. Based on the structure of polymer chains, polymers are divided into:
• Linear polymers
• Branched polymers
• Cross-linked or network polymers Therefore, structure of polymer chain is also a classification parameter.

Step 3: Classification based on mode of polymerization. Depending on how monomers combine to form polymers, they are classified into:
• Addition polymers
• Condensation polymers Hence, mode of polymerization is another valid classification parameter.

Step 4: Identify the incorrect parameter. The boiling point of monomer is a physical property of the monomer molecule and does not affect how polymers are classified. Therefore, it is not used as a parameter for polymer classification. \[ \boxed{\text{Boiling point of monomer}} \]