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Assertion : Dacron is formed by step gro...

Assertion : Dacron is formed by step growth polymerisation of monomer units .
Reason : Dacron fibre is crease resistant .

A

If both assertion and reason are true and reason is the correct explanation of assertion .

B

If both assertion and reason are true but reason is not the correct explanation of assertion .

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that "Dacron is formed by step growth polymerization of monomer units." - Step growth polymerization (also known as condensation polymerization) involves the reaction of two or more different monomers to form a polymer. During this process, smaller molecules (dimers, trimers) are formed, which then combine to create larger molecules (polymers). 2. **Identifying the Monomers**: - For Dacron, the monomers involved are ethylene glycol and terephthalic acid. - The reaction between these two monomers leads to the formation of Dacron, releasing water as a byproduct due to the condensation reaction. 3. **Understanding the Reason**: - The reason states that "Dacron fiber is crease resistant." - Crease resistance refers to the ability of a fabric to resist wrinkling. Dacron, being a polyester, has properties that make it resistant to creasing, which is a desirable characteristic in fibers used for clothing and other applications. 4. **Evaluating the Relationship**: - The assertion is true because Dacron is indeed formed through step growth polymerization. - The reason is also true because Dacron fibers are crease resistant. - However, the reason does not explain the assertion. The fact that Dacron is formed by step growth polymerization does not directly relate to its crease resistance. 5. **Conclusion**: - Both the assertion and reason are true, but the reason is not the correct explanation for the assertion. Therefore, the correct answer is that both the assertion and reason are true, but the reason does not explain the assertion. ### Final Answer: Both the assertion and reason are true, but the reason is not the correct explanation for the assertion. ---
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