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प्रश्न
Write a note on aldol condensation.
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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
Which of the following is a fibre? Nylon, neoprene, PVC
Write the names of monomers of the following polymers.
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?
What are thermoplastic polymers?
Name the monomers and the type of polymerization in each of the following polymers:
Bakelite
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 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
Perion is
Wash and wear clothes are manufactured using
Melamine is
Celanese silk is:-
Which is used for the formation of nylon – 6?
The polymer containing strong intermolecular forces, e.g., hydrogen bonding, is ______.
Match List - I with List - II:
| List - I (Polymer) |
List - II (used for items) |
||
| (A) | Nylon 6, 6 | (I) | Buckets |
| (B) | Low density polythene | (II) | Non-stick utensils |
| (C) | High density polythene | (III) | Bristles of brushes |
| (D) | Teflon | (IV) | Toys |
Choose the correct answer from the options given below:
