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(B) Phenol-formaldehyde resins are formed by a step-growth polymerization or condensation polymerization reaction. This reaction is typically acid- or

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Condensation polymerisation

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(B) Phenol-formaldehyde resins are formed by a step-growth polymerization or condensation polymerization reaction. This reaction is typically acid- or base-catalyzed and involves the elimination of small molecules like water $(H_2O)$. Since the process involves the reaction of monomers with the loss of small molecules,it is classified as condensation polymerization.

The phenol-formaldehyde resins are formed by polymerisation of phenol and formaldehyde by

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