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Which polymer contains the -CO-NH- linkage (urea-formaldehyde resin)

The same question, asked 2 times: 11 May 2023 S2, 22 Apr 2025 S2. Every wording below, oldest first.

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  1. Question 1

    11 May 2023 S2

    83
    Which from following polymers contain -CO-NH- linkage in it?

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  2. Question 2

    22 Apr 2025 S2

    97
    Which from following polymers contains −CO−NH−- CO - NH - linkage?

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