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प्रश्न
Write a note on aldol condensation.
उत्तर
Aldol Condensation : -
When aldehyde or ketone containing α -hydrogen atom is warmed with dilute alkali like dil. NaOH then condensation reaction takes place, a β -hydroxy aldehyde or β -hydroxyl ketones is obtained and the reaction is called as Aldol condensation.
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संबंधित प्रश्न
Write the names and structure of the monomers of the following polymers: Nylon-6, 6
Write the names of monomers of the following polymers.
Write the names of monomer of the following polymer:
How can you differentiate between addition and condensation polymerisation?
How are the following polymers prepared?
Orlon
What are thermoplastic polymers?
What is the significance of number of 6,6 in the polymer nylon-6,6?
Write the name of the monomer of the following polymer:
Nylon – 2 – Nylon – 6
Write the structures of monomers used the following polymers:
Nylon - 6, 6
Which of the following polymers can have strong intermolecular forces?
(i) Nylon
(ii) Polystyrene
(iii) Rubber
(iv) Polyesters
Which factor imparts crystalline nature to a polymer like nylon?
Match the polymers given in Column I with their main applications given in Column II.
| Column I | Column II |
| (i) Bakelite | (a) Unbreakable crockery |
| (ii) Low-density polythene | (b) Non-stick cookwares |
| (iii) Melamine-formaldehyderesin | (c) Packaging material for shock absorbance |
| (iv) Nylon 6 | (d) Electrical switches |
| (v) Polytetrafluoroethane | (e) Squeeze bottles |
| (vi) Polystyrene | (f) Tyre, cords |
Assertion: Polyamides are best used as fibres because of high tensile strength.
Reason: Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence, provide high tensile strength to polymers
Acetic acid is added in the preparation of nylon-6 to
A raw material used in making nylon is
Melamine is
Nylon – 6 is made from
Which is used for the formation of nylon – 6?
The polymer containing strong intermolecular forces, e.g., hydrogen bonding, is ______.
The polymer formed on heating Novolac with formaldehyde is ______.
