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Select the correct preparation of Bakelite proceeds via reactions.
- a)Electrophilic substitution and dehydration
- b)Electrophilic addition and dehydration
- c)Nucleophilic addition and dehydration
- d)Condensation and elimination
Correct answer is option 'A'. Can you explain this answer?
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Select the correct preparation of Bakelite proceeds via reactions.a)El...
Electrophilic Substitution and Dehydration in Bakelite Preparation
Bakelite is a type of thermosetting plastic that is prepared through a series of reactions involving electrophilic substitution and dehydration.
Electrophilic Substitution:
- The first step in Bakelite preparation involves the reaction of phenol with formaldehyde in the presence of an acid catalyst.
- In this electrophilic substitution reaction, the benzene ring of phenol is attacked by the electrophilic carbocation generated from formaldehyde.
- This reaction leads to the formation of a cross-linked polymer with a three-dimensional network structure.
Dehydration:
- After the electrophilic substitution reaction, the resulting polymer undergoes dehydration to eliminate water molecules.
- The elimination of water molecules helps in the formation of strong covalent bonds between the phenol and formaldehyde units in the polymer network.
- This dehydration step is crucial in the curing process of Bakelite, where the polymer hardens and becomes a rigid, thermosetting plastic.
Conclusion:
The correct preparation of Bakelite proceeds via electrophilic substitution and dehydration reactions. These reactions are essential in the formation of the cross-linked polymer structure and the curing of Bakelite into a durable and heat-resistant material.
Bakelite is a type of thermosetting plastic that is prepared through a series of reactions involving electrophilic substitution and dehydration.
Electrophilic Substitution:
- The first step in Bakelite preparation involves the reaction of phenol with formaldehyde in the presence of an acid catalyst.
- In this electrophilic substitution reaction, the benzene ring of phenol is attacked by the electrophilic carbocation generated from formaldehyde.
- This reaction leads to the formation of a cross-linked polymer with a three-dimensional network structure.
Dehydration:
- After the electrophilic substitution reaction, the resulting polymer undergoes dehydration to eliminate water molecules.
- The elimination of water molecules helps in the formation of strong covalent bonds between the phenol and formaldehyde units in the polymer network.
- This dehydration step is crucial in the curing process of Bakelite, where the polymer hardens and becomes a rigid, thermosetting plastic.
Conclusion:
The correct preparation of Bakelite proceeds via electrophilic substitution and dehydration reactions. These reactions are essential in the formation of the cross-linked polymer structure and the curing of Bakelite into a durable and heat-resistant material.
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Select the correct preparation of Bakelite proceeds via reactions.a)El...
Formation of Bakelite:
Electrophilic substitution reaction of phenol with formaldehyde followed by dehydration
Electrophilic substitution reaction of phenol with formaldehyde followed by dehydration
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Select the correct preparation of Bakelite proceeds via reactions.a)Electrophilic substitution and dehydrationb)Electrophilic addition and dehydrationc)Nucleophilic addition and dehydrationd)Condensation and eliminationCorrect answer is option 'A'. Can you explain this answer?
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