JEE Main · 2019 · 09 Apr 2019 · Shift 2 · Polymers

Which of the following compounds is a constituent of the polymer?

(A)Formaldehyde✓ Correct
(B)Ammonia
(C)Methylamine
(D)N - methyl urea

Answer: (A)

Solution

The polymer shown, with its

- NH - CO - NH -

units joined through

- CH2 -

bridges, is urea-formaldehyde resin. It is built by condensing urea with formaldehyde, the formaldehyde first forming methylol groups that then link urea units through methylene bridges. Of the choices offered, formaldehyde is the constituent monomer of this polymer.

JEE Main · 2019 · 09 Apr 2019 · Shift 2 · Single correct option

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