Ethane-1, 2-diol and Benzene-1, 3 dicarboxylic acid
Propane-1, 2-diol and Benzene-1, 4 dicarboxylic acid
Ethane-1, 2-diol and Benzene-1, 4 dicarboxylic acid
Ethane-1, 2-diol and Benzene-1, 2 dicarboxylic acid
Show Solution
The Correct Option isC
Solution and Explanation
Terylene is a commonly known polyester formed through a condensation polymerization reaction. The specific monomers needed for forming Terylene are:
Ethane-1, 2-diol (also known as ethylene glycol)
Benzene-1, 4-dicarboxylic acid (also known as terephthalic acid)
These specific chemicals react to form the polymer due to a condensation reaction, where water molecules are removed as a byproduct. Let's examine why the correct choice is "Ethane-1, 2-diol and Benzene-1, 4 dicarboxylic acid" by examining the chemical details:
Condensation Reaction: In a typical condensation reaction forming a polyester, a diol (a molecule with two hydroxyl groups) reacts with a dicarboxylic acid. In this case, ethane-1, 2-diol provides the hydroxyl (-OH) groups, and benzene-1, 4-dicarboxylic acid provides the carboxyl (-COOH) groups.
Polyester Formation: The reaction leads to the formation of ester linkages \text{-COO-} between the diol and the dicarboxylic acid while eliminating a water molecule for each newly formed linkage.
Structure and Function: Terylene's structure imparts desirable properties such as durability, resistance to stretching and shrinking, and resilience, which are suitable for textile applications.
To confirm that other options are incorrect, consider this:
Ethane-1, 2-diol and Benzene-1, 3 dicarboxylic acid: The position of the carboxyl groups in benzene-1, 3-dicarboxylic acid is not suitable for forming Terylene, leading to a different polymer structure.
Propane-1, 2-diol and Benzene-1, 4 dicarboxylic acid: Substitution or variation in the diol used will result in a different polymer, not the known polyester structure of Terylene.
Ethane-1, 2-diol and Benzene-1, 2 dicarboxylic acid: Use of benzene-1, 2-dicarboxylic acid (ortho isomer) disrupts the linear structure typically required for Terylene.
Hence, the monomers required for Terylene are Ethane-1, 2-diol and Benzene-1, 4-dicarboxylic acid. This setup ensures the structure and properties characteristic of Terylene.
