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Poly β-hydroxybutyrate-co-β-hydroxyvalerate (PHBV) is a copolymer of (1) 2-hydroxybutanoic acid and 3-hydroxypentanoic acid (2) 3-hydroxybutanoic acid and 2-hydroxypentanoic acid (3) 3-hydroxybutanoic acid and 3-hydroxypentanoic acid (4) 3-hydroxybutanoic acid and 4-hydroxypentanoic acid

1. (1) 2-hydroxybutanoic acid and 3-hydroxypentanoic acid
2. (2) 3-hydroxybutanoic acid and 2-hydroxypentanoic acid
3. (3) 3-hydroxybutanoic acid and 3-hydroxypentanoic acid
4. (4) 3-hydroxybutanoic acid and 4-hydroxypentanoic acid

Correct answer: (4) 3-hydroxybutanoic acid and 4-hydroxypentanoic acid

Solution

The correct option identifies the two monomers that combine to form PHBV, which is a copolymer made from 3-hydroxybutanoic acid and 4-hydroxyvaleric acid. This combination allows for the unique properties of PHBV, distinguishing it from other polymers.

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