Question:
Which of the following statement(s) is/are correct?
Which of the following statement(s) is/are correct?
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Keep a handy summary of polymer classifications:
- Starch $\rightarrow$ polymer of $\alpha$-D-glucose.
- Cellulose $\rightarrow$ polymer of $\beta$-D-glucose.
- Natural rubber $\rightarrow$ cis-1,4-polyisoprene.
- Bakelite $\rightarrow$ Phenol + Formaldehyde ($\text{HCHO}$).
- Starch $\rightarrow$ polymer of $\alpha$-D-glucose.
- Cellulose $\rightarrow$ polymer of $\beta$-D-glucose.
- Natural rubber $\rightarrow$ cis-1,4-polyisoprene.
- Bakelite $\rightarrow$ Phenol + Formaldehyde ($\text{HCHO}$).
Updated On: May 25, 2026
- Starch is composed of repeating $\alpha$-D-glucose units.
- Nylon-6 is an addition polymer whereas nylon-6,6 is a condensation polymer.
- Isoprene is the monomer unit of natural rubber.
- Bakelite is obtained from reaction between phenol and acetaldehyde.
Show Solution
Verified By Collegedunia
The Correct Option is A, C
Solution and Explanation
Step 1: Understanding the Question:
We need to evaluate the chemical composition and monomeric units of various natural and synthetic polymers mentioned in the options.
Step 2: Detailed Explanation:
Let us evaluate each statement:
- Statement (A): Starch is a natural polysaccharide polymer composed entirely of repeating $\alpha$-D-glucose units. It consists of two structural fractions: amylose (linear, $\alpha-1,4$-glycosidic bonds) and amylopectin (branched, $\alpha-1,4$ and $\alpha-1,6$-glycosidic bonds). Thus, statement (A) is correct.
- Statement (B): Nylon-6 is synthesized by ring-opening polymerization of caprolactam, and Nylon-6,6 is synthesized by condensation polymerization of adipic acid and hexamethylenediamine. Both are classified as condensation (step-growth) polymers because they contain amide linkages in their backbone. Thus, statement (B) is incorrect.
- Statement (C): Natural rubber is a linear polymer of 2-methylbuta-1,3-diene, commonly known as isoprene. Specifically, it is cis-1,4-polyisoprene. Thus, statement (C) is correct.
- Statement (D): Bakelite is a cross-linked thermosetting polymer obtained from the condensation reaction of phenol with formaldehyde ($\text{HCHO}$), not acetaldehyde ($\text{CH}_3\text{CHO}$). Thus, statement (D) is incorrect.
Step 3: Final Answer:
The correct statements are (A) and (C).
We need to evaluate the chemical composition and monomeric units of various natural and synthetic polymers mentioned in the options.
Step 2: Detailed Explanation:
Let us evaluate each statement:
- Statement (A): Starch is a natural polysaccharide polymer composed entirely of repeating $\alpha$-D-glucose units. It consists of two structural fractions: amylose (linear, $\alpha-1,4$-glycosidic bonds) and amylopectin (branched, $\alpha-1,4$ and $\alpha-1,6$-glycosidic bonds). Thus, statement (A) is correct.
- Statement (B): Nylon-6 is synthesized by ring-opening polymerization of caprolactam, and Nylon-6,6 is synthesized by condensation polymerization of adipic acid and hexamethylenediamine. Both are classified as condensation (step-growth) polymers because they contain amide linkages in their backbone. Thus, statement (B) is incorrect.
- Statement (C): Natural rubber is a linear polymer of 2-methylbuta-1,3-diene, commonly known as isoprene. Specifically, it is cis-1,4-polyisoprene. Thus, statement (C) is correct.
- Statement (D): Bakelite is a cross-linked thermosetting polymer obtained from the condensation reaction of phenol with formaldehyde ($\text{HCHO}$), not acetaldehyde ($\text{CH}_3\text{CHO}$). Thus, statement (D) is incorrect.
Step 3: Final Answer:
The correct statements are (A) and (C).
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