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Polymers
Structures of Common Polymers
1 question from 1 paper, each with its answer.
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Concepts tested
- Repeat unit of Terylene
All Questions
2001 AIPMT 1 question
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Which of the following is not correctly matchedNeoprene is polychloroprene, $[-CH_2-C(Cl)=CH-CH_2-]_n$; correctly matched.
PMMA (polymethyl methacrylate) is $[-CH_2-C(CH_3)(COOCH_3)-]_n$; correctly matched.
Terylene (Dacron) is a polyester of ethylene glycol and terephthalic acid. Its repeat unit is $[-O-CH_2-CH_2-O-CO-C_6H_4-CO-]_n$, with an ester oxygen between each $CH_2$ and C=O.
The structure given for terylene, $-OCH_2-CH_2-CO-C_6H_4-CO-$, has no oxygen between $CH_2$ and C=O, so it is not the correct ester structure.
(The Nylon-66 unit is written with an extra O, but the key treats it as matched; nylon-66 is $[-NH-(CH_2)_6-NH-CO-(CH_2)_4-CO-]_n$.)
So, as per the answer key, terylene is not correctly matched.