JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Polymers

Which polymer has 'chiral' monomer(s)?

(A)Nylon 6, 6
(B)Neoprene
(C)PHBV✓ Correct
(D)Buna-N

Answer: (C)

Solution

PHBV is the copolymer of 3-hydroxybutanoic acid and 3-hydroxypentanoic (3-hydroxyvaleric) acid. In each of these monomers the carbon bearing the hydroxyl group carries four different substituents, making it a stereocentre, so both monomers are chiral. Nylon-6,6, neoprene and Buna-N are all built from monomers that have no such stereocentre, so PHBV is the polymer with chiral monomers.

JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Single correct option

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