Question

Polymer “Z” has a high melting point and it decomposes even before it melts. Hence, it is usually dissolved and subsequently regenerated. Rayon is one such regenerated form. Identify the polymer “Z” from the following options.

• A. Urea formaldehyde
• B. Poly(vinyl carbazole)
• C. Cellulose
• D. Poly(vinyl acetate)

Hint:

Rayon is obtained from cellulose by chemical treatment. Remember: natural polymers like cellulose decompose instead of melting, so regeneration methods are needed.

Answer 1

The Correct Option is C

Step 1: Recall properties of cellulose.
- Cellulose is a natural polymer of glucose units linked by \(\beta\)-1,4-glycosidic bonds.
- It has a highly crystalline structure due to strong hydrogen bonding between chains.
- Because of this, cellulose has a very high decomposition temperature and does not have a sharp melting point.

Step 2: Regenerated cellulose.
- Since cellulose decomposes before melting, it cannot be processed by simple melting.
- Instead, it is dissolved chemically and regenerated into fibers.
- Rayon is a prime example of regenerated cellulose.

Step 3: Eliminate incorrect options.
- (A) Urea formaldehyde → a thermosetting resin, not related to rayon.
- (B) Poly(vinyl carbazole) → used in optoelectronic applications, not regenerated into rayon.
- (D) Poly(vinyl acetate) → can be melted and processed, not a regenerated polymer.
- (C) Cellulose → correct, since rayon is regenerated cellulose. Final Answer: \[ \boxed{\text{(C) Cellulose}} \]