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प्रश्न
Write the reaction involved in the formation of bakelite.
How are the following prepared?
Bakelite
How is bakelite made?
How is bakelite synthesised?
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उत्तर १
Step 1:
Step 2:
Step 3:
उत्तर २
When formaldehyde and phenol react with a basic catalyst present, phenol-formaldehyde resins are created. Methylene bridges can develop at ortho, para, or both ortho and para locations during the process. This allows for the preparation of phenol-formaldehyde resin, often known as bakelite, a linear or cross-linked polymer.
Novolac is a linear polymer used in paints. Novolac undergoes cross-linking when heated with formaldehyde, forming an infusible solid mass known as Bakelite.
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
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Answer the following.
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Answer the following.
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Answer the following.
Match the following pairs:
| Name of polymer | Monomer |
| 1. Teflon | a. CH2 = CH2 |
| 2. PVC | b. CF2 = CF2 |
| 3. Polyester | c. CH2 = CHCl |
| 4. Polythene | d. C6H5OH and HCHO |
| 5. Bakelite | e. Dicarboxylic acid and polyhydoxyglycol |
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\[\ce{n HOOC–R–COOH + n HO–R'–OH}\]
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write the structure of the monomer used in natural rubber.
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\[\begin{array}{cc}
\ce{(-CF2-CF2-), -[NH-(CH2)5-CO] -, -(CH2-CH-), (-CH2-CH2-)}\\
\phantom{............................}|\\
\phantom{..............................}\ce{CN}
\end{array}\]
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| (ii) Nylon | (b) Ester linkage |
| (iii) Cellulose | (c) Phosphodiester linkage |
| (iv) Protein | (d) Amide linkage |
| v) RNA |
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Name and draw structure of the repeating unit in natural rubber.
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