Q39 / 155 · WBJEE 2026 · Chemistry
Which of the following statement(s) is/are correct?
- Correct answerAStrach is composed of repeating $\alpha$–D glucose units
- BNylon-6 is an addition polymer whereas nylon–6,6 is a condensation polymer
- Correct answerCIsoprene is the monomer unit of natural rubber
- DBakelite is obtained from reaction between phenol and acetaldehyde
Solution
Starch is a polysaccharide composed of repeating $\alpha$-D-glucose units, which form amylose and amylopectin. Thus, statement (A) is correct.
Nylon-6 is synthesized from caprolactam and Nylon-6,6 is synthesized from hexamethylenediamine and adipic acid. Both are polyamides and are classified as condensation polymers. Thus, statement (B) is incorrect.
Natural rubber is a linear polymer of isoprene (2-methyl-1,3-butadiene) and is also called cis-1,4-polyisoprene. Thus, statement (C) is correct.
Bakelite is a condensation polymer obtained from the reaction between phenol and formaldehyde, not acetaldehyde. Thus, statement (D) is incorrect.
Answer: Strach is composed of repeating $\alpha$–D glucose units; Isoprene is the monomer unit of natural rubber
Nylon-6 is synthesized from caprolactam and Nylon-6,6 is synthesized from hexamethylenediamine and adipic acid. Both are polyamides and are classified as condensation polymers. Thus, statement (B) is incorrect.
Natural rubber is a linear polymer of isoprene (2-methyl-1,3-butadiene) and is also called cis-1,4-polyisoprene. Thus, statement (C) is correct.
Bakelite is a condensation polymer obtained from the reaction between phenol and formaldehyde, not acetaldehyde. Thus, statement (D) is incorrect.
Answer: Strach is composed of repeating $\alpha$–D glucose units; Isoprene is the monomer unit of natural rubber
Hence, the correct answer is options: 'A', 'C'.