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प्रश्न
Which of the following polymers are condensation polymers?
(i) Bakelite
(ii) Teflon
(iii) Butyl rubber
(iv) Melamine formaldehyde resin
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उत्तर
(i) Bakelite
(iv) Melamine formaldehyde resin
Explanation:
Novolac on heating with formaldehyde undergoes cross-linking to form an infusible solid mass called bakelite.
Bakelite
Melamine formaldehyde polymer is formed by the condensation polymerisation of melamine and formaldehyde.
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