Which of the following is a biodegradable polymer ?
Show Hint
The Correct Option is A
Solution and Explanation
Option (1): \(-[\mathrm{NH-(CH_2)_5-CO-NH-CH_2-CO}]_n-\) is built from 6-aminohexanoic acid and glycine (2-aminoethanoic acid), i.e. nylon-2-nylon-6, a biodegradable polyamide.
Option (2): \(-[\mathrm{NH-(CH_2)_5-CO}]_n-\) is nylon-6 (from caprolactam), not biodegradable.
Option (3): \(-[\mathrm{NH-(CH_2)_6-NHCO-(CH_2)_4-CO}]_n-\) is nylon-6,6, not biodegradable.
Option (4): \(-[\mathrm{CO-C_6H_4-COO-(CH_2)_2-O}]_n-\) is terylene (PET/Dacron), not biodegradable.
Answer: (1) the nylon-2-nylon-6 repeat unit \(-[\mathrm{HN-(CH_2)_5-CONH-CH_2-CO}]_n-\)
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