Poly - $\beta$-hydroxybutyrate-co- $\beta$-hydroxyvalerate(PHBV) is a copolymer of \_\_\_\_

(A) 3-hydroxybutanoic acid and 4-hydroxypentanoic acid

(C) 3-hydroxybutanoic acid and 2-hydroxypentanoic acid

JEE Main · 2019 · 12 Jan 2019 · Shift 1 · Polymers

Poly -

β

-hydroxybutyrate-co-

β

-hydroxyvalerate(PHBV) is a copolymer of ____

(A)3-hydroxybutanoic acid and 4-hydroxypentanoic acid
(B)2-hydroxybutanoic acid and 3-hydroxypentanoic acid
(C)3-hydroxybutanoic acid and 2-hydroxypentanoic acid
(D)3-hydroxy butanoic acid and 3-hydroxypentanoic acid✓ Correct

Answer: (D)

Solution

PHBV is the copolymer poly(

β

-hydroxybutyrate-co-

β

-hydroxyvalerate). The

β

, or 3-, label tells you the hydroxyl sits on the third carbon of each monomer, so the building blocks are 3-hydroxybutanoic acid and 3-hydroxypentanoic acid, which polymerise together to give this biodegradable plastic.

JEE Main · 2019 · 12 Jan 2019 · Shift 1 · Single correct option

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