When melamine and formaldehyde polymerise,a r | vedclass

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(C) The reaction between melamine ($2,4,6-$triamino$-1,3,5-$triazine) and formaldehyde proceeds via a nucleophilic addition reaction to form a methylo

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(C) The reaction between melamine ($2,4,6-$triamino$-1,3,5-$triazine) and formaldehyde proceeds via a nucleophilic addition reaction to form a methylol derivative. Specifically,the reaction of one molecule of melamine with one molecule of formaldehyde yields monomethylol melamine,which acts as an intermediate in the synthesis of melamine-formaldehyde resin. The structure shown in option $C$ represents this monomethylol melamine intermediate,where one of the $-NH_2$ groups has reacted with formaldehyde to form $-NHCH_2OH$.

When melamine and formaldehyde polymerise,a resin intermediate is formed. Identify the structure of this intermediate :-

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