Identify the structure of urea-formaldehyde resin

1. A.
   Structure (a)
2. B.
   Structure (b)
3. C.
   Structure (c)
4. D.
   Structure (d)

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1. A.
   $\mathrm{\left[CH_2 - \underset{\displaystyle CONH_2}{\underset{|}{CH}}\right]_n}$
2. B.
   $\mathrm{\left[CH_2 - \underset{\displaystyle C_6H_5}{\underset{|}{CH}}\right]_n}$
3. C.
   $\mathrm{[NH - CO - NH - CH_2]_n}$
4. D.
   $\mathrm{[NH - (CH_2)_5 - CO]_n}$

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