Which of the following monomers form biodegradable polymers ?
- Ethylene glycol and pthalic acid
- Caprolactum and 1,3- Butadiene
- Phenol and formaldehyde
- 3-hydroxybutanoic acid and 3-hydroxypentanoic acid
The Correct Option is D
Approach Solution - 1
- Option A: Phenol and formaldehyde
Forms phenolic resins, which are not biodegradable. These are synthetic materials that do not degrade easily in nature.
- Option B: 3-hydroxybutanoic acid and 3-hydroxypentanoic acid
Correct. These monomers form polyhydroxyalkanoates (PHAs), which are biodegradable polymers. PHAs are produced by bacteria and can decompose naturally in the environment.
- Option C: Ethylene glycol and phthalic acid
Forms polyethylene terephthalate (PET), which is not biodegradable. PET is commonly used for bottles and fibers but is resistant to biodegradation.
- Option D: Caprolactam and 1,3-Butadiene
Forms nylon 6 and synthetic rubber, which are both not biodegradable. These materials do not easily break down in the environment.
Conclusion:
The correct answer is Option B: 3-hydroxybutanoic acid and 3-hydroxypentanoic acid, as they form biodegradable polymers such as polyhydroxyalkanoates (PHAs).
Approach Solution -2
Biodegradable polymers are made from monomers that can degrade naturally in the environment. Among the given options:
Option A (Ethylene glycol and phthalic acid): These monomers form PET (Polyethylene terephthalate), which is not biodegradable.
Option B (Caprolactam and 1, 3-Butadiene): Caprolactam forms Nylon-6, which is not biodegradable. 1, 3-Butadiene is used in synthetic rubber production.
Option C (Phenol and formaldehyde): These form phenolic resins, which are not biodegradable.
Option D (3-hydroxybutanoic acid and 3-hydroxypentanoic acid): These monomers are used to form polyhydroxyalkanoates (PHA), which are biodegradable polymers.
Therefore, the correct answer is: \({\text{(D) 3-hydroxybutanoic acid and 3-hydroxypentanoic acid}}\)
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