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Polyesters can be defined as the condensation products of
- a)dicarboxylic acids with dihydroxy alcohols
- b)bi-phenol A and epichlorohydrin
- c)phenol and formaldehyde
- d)benzene and toluene
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Polyesters can be defined as the condensation products ofa)dicarboxyli...
Polyesters are a class of polymers that are widely used in various applications such as textiles, packaging, and coatings. They are formed by the condensation reaction between a dicarboxylic acid and a dihydroxy alcohol or their derivatives. However, the given question is asking for the definition of polyesters based on their specific starting materials.
Definition of Polyesters
Polyesters can be defined as the condensation products of phenol and formaldehyde. This type of polyester is known as phenolic resin, which is a thermosetting polymer that can be molded into various shapes and forms. Phenolic resins are widely used in the production of electrical components, automotive parts, and consumer goods due to their excellent mechanical and thermal properties.
Explanation of Options
Option A: Dicarboxylic acids with dihydroxy alcohols - This is a common starting material for the synthesis of polyesters, but it is not the only one. Polyesters formed from dicarboxylic acids and dihydroxy alcohols are known as polyethylene terephthalate (PET), which is used in the production of bottles, fibers, and films.
Option B: Bi-phenol A and epichlorohydrin - This is the starting material for the synthesis of epoxy resins, which are a type of thermosetting polymer used in coatings, adhesives, and composites. Epoxy resins have excellent adhesion, chemical resistance, and mechanical properties.
Option C: Phenol and formaldehyde - This is the correct answer for the given question. Phenol and formaldehyde react to form phenolic resins, which are a type of thermosetting polymer used in various applications.
Option D: Benzene and toluene - This is not a starting material for the synthesis of polyesters. Benzene and toluene are aromatic hydrocarbons used as solvents and intermediates in the production of various chemicals.
Conclusion
In conclusion, polyesters are a class of polymers formed by the condensation reaction between a dicarboxylic acid and a dihydroxy alcohol or their derivatives. However, the given question is asking for the definition of polyesters based on their specific starting materials, and the correct answer is phenol and formaldehyde, which form phenolic resins.
Definition of Polyesters
Polyesters can be defined as the condensation products of phenol and formaldehyde. This type of polyester is known as phenolic resin, which is a thermosetting polymer that can be molded into various shapes and forms. Phenolic resins are widely used in the production of electrical components, automotive parts, and consumer goods due to their excellent mechanical and thermal properties.
Explanation of Options
Option A: Dicarboxylic acids with dihydroxy alcohols - This is a common starting material for the synthesis of polyesters, but it is not the only one. Polyesters formed from dicarboxylic acids and dihydroxy alcohols are known as polyethylene terephthalate (PET), which is used in the production of bottles, fibers, and films.
Option B: Bi-phenol A and epichlorohydrin - This is the starting material for the synthesis of epoxy resins, which are a type of thermosetting polymer used in coatings, adhesives, and composites. Epoxy resins have excellent adhesion, chemical resistance, and mechanical properties.
Option C: Phenol and formaldehyde - This is the correct answer for the given question. Phenol and formaldehyde react to form phenolic resins, which are a type of thermosetting polymer used in various applications.
Option D: Benzene and toluene - This is not a starting material for the synthesis of polyesters. Benzene and toluene are aromatic hydrocarbons used as solvents and intermediates in the production of various chemicals.
Conclusion
In conclusion, polyesters are a class of polymers formed by the condensation reaction between a dicarboxylic acid and a dihydroxy alcohol or their derivatives. However, the given question is asking for the definition of polyesters based on their specific starting materials, and the correct answer is phenol and formaldehyde, which form phenolic resins.
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Polyesters can be defined as the condensation products ofa)dicarboxylic acids with dihydroxy alcoholsb)bi-phenol A and epichlorohydrinc)phenol and formaldehyded)benzene and tolueneCorrect answer is option 'C'. Can you explain this answer?
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Polyesters can be defined as the condensation products ofa)dicarboxylic acids with dihydroxy alcoholsb)bi-phenol A and epichlorohydrinc)phenol and formaldehyded)benzene and tolueneCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Polyesters can be defined as the condensation products ofa)dicarboxylic acids with dihydroxy alcoholsb)bi-phenol A and epichlorohydrinc)phenol and formaldehyded)benzene and tolueneCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Polyesters can be defined as the condensation products ofa)dicarboxylic acids with dihydroxy alcoholsb)bi-phenol A and epichlorohydrinc)phenol and formaldehyded)benzene and tolueneCorrect answer is option 'C'. Can you explain this answer?.
Polyesters can be defined as the condensation products ofa)dicarboxylic acids with dihydroxy alcoholsb)bi-phenol A and epichlorohydrinc)phenol and formaldehyded)benzene and tolueneCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Polyesters can be defined as the condensation products ofa)dicarboxylic acids with dihydroxy alcoholsb)bi-phenol A and epichlorohydrinc)phenol and formaldehyded)benzene and tolueneCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Polyesters can be defined as the condensation products ofa)dicarboxylic acids with dihydroxy alcoholsb)bi-phenol A and epichlorohydrinc)phenol and formaldehyded)benzene and tolueneCorrect answer is option 'C'. Can you explain this answer?.
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