Question

The chemical name of melamine is
A.2,4 – diamino – 1,3,5 – triazine
B.2 – amino – 1,3,5 – triazine
C.2,4,6 – triamino – 1,3,5 – triazine
D.1,3,5 – triamino – 2,4,6 - triazine

Answer 1

To solve this question, we must first draw the molecular structure of melamine. Then on the basis of the IUPAC rules, we can name the given compound.

Complete step by step answer:
Before we move forward with the solution of the given question, let us first understand some important basic concepts.
The nomenclature rules of IUPAC can be given as:
1.Find the longest chain of carbon atoms. This will be the parent chain of the compound.
2.Then identify all the substituents of the functional groups.
3.While numbering the functional group, the numbering on the parent chain should be such that it should be closest to the terminal carbon atom.
4.If the same functional group is occurring more than once, then while mentioning the functional group in the name of the hydrocarbon, appropriate position numbering should be mentioned. In addition, the number of times the substituent group occurs is indicated by a prefix (di, tri, tetra, etc.).
5.If chains of equal length are competing for selection as the parent chain, then the choice goes in series to:
a) the chain which has the greatest number of side chains.
b) the chain whose substituents have the lowest- numbers.
c) the chain having the greatest number of carbon atoms in the smaller side chain.
d)the chain having the least branched side chains.
The molecular structure of melamine can be given as:

We can see that the base structure of the compound is hexa-cyclic structure. We can also observe that there are 3 nitrogen atoms alternately on the ring, and there are 3 amine substituents present on the 3 carbon vertices. Hence, the base structure of the compound is a tri-nitrogen or triazine structure where the 3 carbon atoms are substituted with 3 nitrogen atoms. The positions at which these nitrogen atoms are substituted are 1,3,5. Also, the positions at which the amine functional group is present are 2,4,6. Hence, the chemical name of melamine can be given as:
2,4,6 – triamino – 1,3,5 – triazine

Hence, Option C is the correct option.

Note:
Melamine can be combined with formaldehyde and other agents to produce melamine resins. Such resins are characteristically durable thermosetting plastic used in high pressure decorative laminates.