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Which of the following compounds is a constituent of the polymer [–HN–C(=O)–NH–CH2–]n ?

1. N-Methyl urea
2. Ammonia
3. Formaldehyde
4. Methylamine

Correct answer: Formaldehyde

Solution

The repeating unit [-HN-C(=O)-NH-CH2-]n is urea-formaldehyde resin, formed from urea and formaldehyde. Among the choices, formaldehyde is the constituent monomer.

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