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The homopolymer formed from 4-hydroxy-butanoic acid is :

1. C – (CH 2 ) 2 C– O O n O
2. OC(CH 2 ) 3 – O O n
3. C(CH 2 ) 3 – O O n
4. C – (CH 2 ) 2 C O O n

Correct answer: C(CH 2 ) 3 – O O n

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