Advertisements
Advertisements
प्रश्न
Write the reaction involved in the formation of bakelite.
How are the following prepared?
Bakelite
How is bakelite made?
How is bakelite synthesised?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Write the reactions involved in the preparation of PVC
Explain the following term: Homopolymers
The Zieglar-Natta catalyst is used in the preparation of _______.
(A) LDPE
(B) PHBV
(C) PAN
(D) HDPE
Write the structures of the monomers used for getting the following polymers
Melamine – formaldehyde polymer
Write the monomers of the following polymer :
Answer the following in one sentence.
Identify 'A' in the following reaction:
Answer the following in one sentence.
Identify 'B' in the following reaction:
\[\ce{H2N -(CH2)6 - NH2 + HOOC - (CH2)4 - COOH ->[N2][533 K]}\]'B'
Answer the following in one sentence.
Define the term: Vulcanization
Answer the following in one sentence.
Identify thermoplastic and thermosetting plastic from the following:
- PET
- Urea formaldehyde resin
- Polythene
- Phenol formaldehyde resin
Answer the following.
Write the reaction of the formation of Nylon 6.
Answer the following.
Write the reaction of the formation of Terylene.
Answer the following.
Write structure of natural rubber and neoprene rubber along with the name and structure of their monomers.
Answer the following.
Draw the structures of polymers formed from the following monomers
H2N–(CH2)5 – COOH
Answer the following.
Is synthetic rubber better than natural rubber? If so, in what respect?
Write the structure of isoprene and the polymer obtained from it.
Nylon 6, 6 is a condensation polymer of hexamethylenediamine and _____________
Write a chemical reaction for the preparation of the following polymer.
polyacrylonitrile
write the structure of the monomer used in natural rubber.
Write chemical reaction for preparation of the following.
Neoprene
Write the name and formulae of the monomers used for the preparation of dacron.
Explain vulcanization of rubber.
The INCORRECT match for the polymer with its application is:
Identify the INCORRECT match.
Novolac is obtained from ____________.
Identify the polymer obtained by polymerization of n moles of acrylonitrile.
Which among the following polymers is obtained from CH2 = CH – CN by polymerisation?
Which among the following catalysts is used in the preparation of dacron?
Which of the following polymers is prepared by using phenol?
Which among the following polymers is an example of addition polymer?
Which of the following pair of compounds is used as monomers for bakelite?
Which of the following polymer is used to make blankets?
Name the polymers used in laminated sheets and give the name of monomeric units involved in its formation.
Phenol and formaldehyde undergo condensation to give a polymar (A) which on heating with formaldehyde gives a thermosetting polymer (B). Name the polymers. Write the reactions involved in the formation of (A). What is the structural difference between two polymers?
F2C = CF2 is monomer of the polymer -
Which of the following polymer has ester linkage?
Identify the monomer used to prepare neoprene.
Which of the foolowing polymer is used in the manufacture of insulators.
Answer the following.
Name and draw structure of the repeating unit in natural rubber.
Answer the following.
Name and draw structure of the repeating unit in natural rubber.
Name and draw the structure of the repeating unit in natural rubber.
Write the structure of isoprene and the polymer obtained from it.
Another name of terylene is ______.
Write the structure and name of the monomer of Nylon-6.
Write the structure of isoprene and the polymer obtained from it.
Name and draw structure of the repeating unit in natural rubber.
Write the structure of isoprene and the polymer obtained from it.
Name and draw the structure of the repeating unit in natural rubber.
Write the structure of isoprene and the polymer obtained from it.
Name and draw structure of the repeating unit in natural rubber.
Which from following statements is NOT true regarding neoprene?
