Question

Rayon is a semisynthetic polymer whose properties are better than natural cotton. Mechanical and aesthetic properties of cellulose can be improved by acetylation.

• A. Both assertion and reason are correct, and the reason is the correct explanation for the assertion
• B. Both assertion and reason are correct, but the reason is not the correct explanation for the assertion
• C. Assertion is incorrect statement, but the reason is correct
• D. Both assertion and reason are incorrect

Answer 1

The Correct Option is A

The question provided is regarding the comparison of rayon and natural cotton, specifically addressing the assertion that rayon is a semisynthetic polymer with improved properties over natural cotton, and the reason that acetylation enhances the properties of cellulose.

Let's analyze each component:

1. Assertion: "Rayon is a semisynthetic polymer whose properties are better than natural cotton."
   • Rayon is considered a semisynthetic polymer because it is produced from natural cellulose (usually derived from wood pulp or other natural sources), but processed chemically to create a fiber that maintains some natural properties while enhancing others.
   • Compared to natural cotton, rayon can have superior properties such as softer texture, greater ability to take dyes, increased luster, and in some cases, enhanced tensile strength and durability.
   • Hence, the assertion is correct.
2. Reason: "Mechanical and aesthetic properties of cellulose can be improved by acetylation."
   • Acetylation is a chemical process where an acetyl functional group is introduced into a compound. In the context of cellulose, acetylation results in cellulose acetate, a derivative known for improved qualities such as resistance to wrinkles, increased sheen, and greater strength.
   • This chemical transformation leads to improved mechanical properties (like flexibility and durability) and aesthetic properties (such as sheen and texture). Therefore, the reason given is correct.

In summary, both the assertion and reason are accurate. The reason effectively explains why the properties of cellulose (and thus rayon) can be improved, justifying why rayon could be seen as having improved qualities over natural cotton. Therefore, the correct answer is: Both assertion and reason are correct, and the reason is the correct explanation for the assertion.