Polymers
Q. What is the IUPAC name for the polymer formed from the monomer 1,3-butadiene?
A.
Polybutadiene
B.
Polybuta-1,3-diene
C.
Poly(1,3-butadiene)
D.
Polybutylene
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Solution
The correct IUPAC name for the polymer formed from 1,3-butadiene is Poly(1,3-butadiene), which indicates the structure of the repeating unit.
Correct Answer: C — Poly(1,3-butadiene)
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Q. What is the IUPAC name for the polymer formed from the monomer styrene?
A.
Polystyrene
B.
Polyethylene
C.
Polypropylene
D.
Polyvinyl chloride
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Solution
The polymer formed from the monomer styrene is called polystyrene, which is widely used in various applications.
Correct Answer: A — Polystyrene
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Q. What is the primary mechanism by which addition polymers are formed?
A.
Nucleophilic substitution
B.
Electrophilic addition
C.
Free radical mechanism
D.
Electrophilic substitution
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Solution
Addition polymers are primarily formed through a free radical mechanism, where free radicals initiate the polymerization process.
Correct Answer: C — Free radical mechanism
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Q. What is the repeating unit in the polymer polystyrene?
A.
C6H5CH=CH2
B.
C8H8
C.
C6H5C(CH3)=CH2
D.
C6H5C2H4
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Solution
The repeating unit in polystyrene is derived from the monomer styrene, which has the formula C8H8.
Correct Answer: B — C8H8
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Q. What type of isomerism is exhibited by polymers with chiral centers?
A.
Geometric isomerism
B.
Structural isomerism
C.
Stereoisomerism
D.
Functional isomerism
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Solution
Polymers with chiral centers can exhibit stereoisomerism, which includes configurations that differ in the spatial arrangement of atoms.
Correct Answer: C — Stereoisomerism
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Q. What type of isomerism is exhibited by polymers with different arrangements of their substituents?
A.
Geometric isomerism
B.
Structural isomerism
C.
Stereoisomerism
D.
Conformational isomerism
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Solution
Geometric isomerism occurs in polymers when substituents are arranged differently around a double bond, leading to cis and trans forms.
Correct Answer: A — Geometric isomerism
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Q. What type of polymer is formed when amino acids link together through peptide bonds?
A.
Polysaccharide
B.
Protein
C.
Nucleic acid
D.
Lipid
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Solution
Proteins are polymers formed by the linkage of amino acids through peptide bonds, which are a type of condensation reaction.
Correct Answer: B — Protein
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Q. Which of the following functional groups is commonly found in polyesters?
A.
Amide
B.
Ester
C.
Alcohol
D.
Aldehyde
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Solution
Polyesters are formed from the reaction of diols and dicarboxylic acids, which contain ester functional groups.
Correct Answer: B — Ester
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Q. Which of the following is a characteristic of condensation polymerization?
A.
It produces small molecules as byproducts
B.
It requires high temperatures
C.
It only involves alkenes
D.
It is a one-step process
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Solution
Condensation polymerization typically involves the reaction of two different monomers, resulting in the release of small molecules such as water or methanol.
Correct Answer: A — It produces small molecules as byproducts
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Q. Which of the following polymers is known for its high tensile strength and is commonly used in fibers?
A.
Polyethylene
B.
Nylon
C.
Polystyrene
D.
Polyvinyl chloride
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Solution
Nylon is a synthetic polymer known for its high tensile strength and is widely used in textiles and fibers.
Correct Answer: B — Nylon
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Q. Which of the following polymers is known for its high thermal stability and is often used in engineering applications?
A.
Polyethylene
B.
Polystyrene
C.
Polyimide
D.
Polyvinyl chloride
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Solution
Polyimide is known for its high thermal stability and is used in applications such as aerospace and electronics.
Correct Answer: C — Polyimide
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Q. Which of the following statements about thermoplastics is true?
A.
They can be reshaped upon heating
B.
They are chemically cross-linked
C.
They have a fixed shape
D.
They are always biodegradable
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Solution
Thermoplastics can be reshaped upon heating, allowing them to be molded into various forms, unlike thermosetting plastics which cannot be reshaped once set.
Correct Answer: A — They can be reshaped upon heating
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Q. Which polymer is known for its use in making plastic bottles and containers?
A.
Polyethylene terephthalate (PET)
B.
Polylactic acid (PLA)
C.
Polyvinyl chloride (PVC)
D.
Polypropylene (PP)
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Solution
Polyethylene terephthalate (PET) is widely used for making plastic bottles and containers due to its strength and recyclability.
Correct Answer: A — Polyethylene terephthalate (PET)
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