Question

________ is a thermosetting polymer obtained by condensation of chloroepoxy alkanes with dihydric phenol.​

Answer 1

Answer:

Bakelite was the first plastic made from synthetic components. It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol(C

6

H

5

OH) with formaldehyde(HCHO).

Hence, option D is correct.

Answer 2

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Answer:

Phenol - formaldehyde polymers are the oldest synthetic polymers. These are obtained by the condensation reaction of phenol with formaldehyde in the presence of either an acid or a base catalyst. The reaction starts with the initial formation of o- (and/or) p-hydroxymethyl phenol derivatives, which further react with phenol to form compounds having rings joined to each other through –CH2 groups. The initial product could be a linear product – Novolac, used in paints.

Novolac on heating with formaldehyde undergoes cross-linking by elimination of water molecules to form an infusible solid mass called bakelite. It is a thermosetting phenol-formaldehyde resin used for making adhesives.