Explanation:
More is the mass of directly attached atom more will be the priority of the group attached to the alkyl or aryl chain.
Atomic mass of oxygen is 16, nitrogen is 14, carbon is 12, and hydrogen is 1.
This means that as the atomic mass of oxygen is greater than rest of the given atoms. So, priority will be given to the oxygen atom.
Thus, we can conclude that the given groups are placed in order of decreasing priority as follows.
-OH > [tex]-NH_{2}[/tex] > -COOH > -H
The order of decreasing priority for the given functional groups is;
−COOH > −OH > −NH2 > −H
The functional groups are atoms, group of atoms or bonds that control the chemical reactivity of a given homologous series. A homologous series refers to a family of compounds that have a common functional group and differ from each other by -CH2-group.
The order of priority refers to the order of importance of functional groups when naming a molecule. It applies when many functional groups are present on a molecule.
The order of decreasing priority for the given functional groups is;
−COOH > −OH > −NH2 > −H.
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