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Question
Which polymer has ‘chiral’ monomer(s)?
Which polymer has ‘chiral’ monomer(s)?
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Solution
The correct option is C PHBV
In a chiral molecule, there is a chiral center. Chiral centers are tetrahedral, mostly carbons, that have four different substituents.
In the given options, there are four polymers which are PHBV; Nylon 6,6; Buna-N; Neoprene. The structures of these polymers are as follows,
- PHBV:
(−O−CHCH3−CH2−CO−O−CHC2H5−CH2−CO−)n
- Nylon 6,6:
[−CO(CH2)4CO−NH(CH2)6NH−]n
- Buna-N:
[−CH2−CH=CH−CH2−CH(CN)−CH2−]n
- Neoprene:
(−CH2−CH=CCl−CH2−)n
The monomers that are the subunits of the above polymers are as follows:
1.
PHBV:
CH3−CHOH−CH2−COOH
which is called 3-hydroxybutanoic acid and CH3−CH2−CHOH−CH2−COOH
which is called 3-hydroxypentanoic acid, are the two monomers of PHBV.
2.
Nylon 6,6:
HO2C−(CH2)4−CO2H
which is called adipic acid and H2N−(CH2)6−NH2
which is called hexamethylenediamine, are the two monomers of Nylon 6,6.
3.
Buna-N:
CH2=CH−CH=CH2
which is called 1,3-butadiene and CH(CN)=CH2
which is called acrylonitrile, are the two monomers of Buna-N.
4.
Neoprene:
CH2=CH−CCl=CH2
which is called chloroprene is the monomer of Neoprene.
In both the monomers of PHBV, the chiral center or the chiral carbon has four different substituents. In 3-hydroxybutanoic acid, the third carbon has these four different groups:
−OH,−CH3,−H,−CH2COOH.
In 3-hydroxypentanoic acid, the third carbon has these four different groups:
−OH,−CH2CH3,−CH2COOH,−H
Hence, both these monomers are chiral.
Therefore, the correct answer is option (a) that is PHBV.
In a chiral molecule, there is a chiral center. Chiral centers are tetrahedral, mostly carbons, that have four different substituents.
In the given options, there are four polymers which are PHBV; Nylon 6,6; Buna-N; Neoprene. The structures of these polymers are as follows,
- PHBV:
(−O−CHCH3−CH2−CO−O−CHC2H5−CH2−CO−)n - Nylon 6,6:
[−CO(CH2)4CO−NH(CH2)6NH−]n - Buna-N:
[−CH2−CH=CH−CH2−CH(CN)−CH2−]n - Neoprene:
(−CH2−CH=CCl−CH2−)n
1.
PHBV:
CH3−CHOH−CH2−COOH
which is called 3-hydroxybutanoic acid and CH3−CH2−CHOH−CH2−COOH
which is called 3-hydroxypentanoic acid, are the two monomers of PHBV.
2.
Nylon 6,6:
HO2C−(CH2)4−CO2H
which is called adipic acid and H2N−(CH2)6−NH2
which is called hexamethylenediamine, are the two monomers of Nylon 6,6.
3.
Buna-N:
CH2=CH−CH=CH2
which is called 1,3-butadiene and CH(CN)=CH2
which is called acrylonitrile, are the two monomers of Buna-N.
4.
Neoprene:
CH2=CH−CCl=CH2
which is called chloroprene is the monomer of Neoprene.
In both the monomers of PHBV, the chiral center or the chiral carbon has four different substituents. In 3-hydroxybutanoic acid, the third carbon has these four different groups:
−OH,−CH3,−H,−CH2COOH.
In 3-hydroxypentanoic acid, the third carbon has these four different groups:
−OH,−CH2CH3,−CH2COOH,−H
Hence, both these monomers are chiral.
Therefore, the correct answer is option (a) that is PHBV.
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