Answer
Verified
397.5k+ views
Hint:
Polymers are formed by joining together through covalent bonds, a large number of simple repeating structural units derived from same or different small molecules called monomers. Repeating unit in glyptal is obtained by condensation of dibasic acids (or their anhydrides) with dihydric or trihydric alcohols.
Complete step by step answer:
Glyptal are polyesters formed by the condensation of organic acids having two acid functional groups such as phthalic acid, maleic acids, etc and alcohols with two or more hydroxyl groups. They are also called alkyd resins.
From the options given above, we can rule out the options (C) and (D). Since in option (C), there is no polyhydric alcohol and option (D) has acetic acid which is monobasic and phenol.
Malonic acid (\[COOH-C{{H}_{2}}-COOH\]) and ethylene glycol given in option (A) do not form polyester. Though malonic acid is a saturated dibasic acid, it is very unstable and heating gives acetic acid.
The simplest glyptal is formed by the polymerization of dibasic phthalic acid and dihydric alcohol, i.e., ethylene glycol with removal of water as a byproduct. The polymer thus formed is called poly (ethylene phthalate).
Therefore, the correct answer is option (B).
Additional Information:
Glyptal (polyethylene phthalate) is a thermoplastic. It, when dissolved in suitable solvents, forms a solution which evaporates from a tough, inflexible film. This property of glyptal is exploited to manufacture paints and lacquers.
Note:
Note that two monomers, i.e. phthalic acid and ethylene glycol undergo condensation reaction with the elimination of water, to form a unit which is repeated in regular fashion to obtain glyptal polymer. Sometimes, trihydric alcohol, i.e. glycerol is used instead of ethylene glycol along with phthalic acid in the condensation polymerization reaction to form glyptal.
Polymers are formed by joining together through covalent bonds, a large number of simple repeating structural units derived from same or different small molecules called monomers. Repeating unit in glyptal is obtained by condensation of dibasic acids (or their anhydrides) with dihydric or trihydric alcohols.
Complete step by step answer:
Glyptal are polyesters formed by the condensation of organic acids having two acid functional groups such as phthalic acid, maleic acids, etc and alcohols with two or more hydroxyl groups. They are also called alkyd resins.
From the options given above, we can rule out the options (C) and (D). Since in option (C), there is no polyhydric alcohol and option (D) has acetic acid which is monobasic and phenol.
Malonic acid (\[COOH-C{{H}_{2}}-COOH\]) and ethylene glycol given in option (A) do not form polyester. Though malonic acid is a saturated dibasic acid, it is very unstable and heating gives acetic acid.
The simplest glyptal is formed by the polymerization of dibasic phthalic acid and dihydric alcohol, i.e., ethylene glycol with removal of water as a byproduct. The polymer thus formed is called poly (ethylene phthalate).
Therefore, the correct answer is option (B).
Additional Information:
Glyptal (polyethylene phthalate) is a thermoplastic. It, when dissolved in suitable solvents, forms a solution which evaporates from a tough, inflexible film. This property of glyptal is exploited to manufacture paints and lacquers.
Note:
Note that two monomers, i.e. phthalic acid and ethylene glycol undergo condensation reaction with the elimination of water, to form a unit which is repeated in regular fashion to obtain glyptal polymer. Sometimes, trihydric alcohol, i.e. glycerol is used instead of ethylene glycol along with phthalic acid in the condensation polymerization reaction to form glyptal.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Write an application to the principal requesting five class 10 english CBSE
Difference Between Plant Cell and Animal Cell
a Tabulate the differences in the characteristics of class 12 chemistry CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
What organs are located on the left side of your body class 11 biology CBSE
Discuss what these phrases mean to you A a yellow wood class 9 english CBSE
List some examples of Rabi and Kharif crops class 8 biology CBSE