Question
Write $\text{IUPAC}$ names for the following structures:
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Answer
Here, the principal functional group, ketone is located at the $C-3$ on the five carbon chain. The $-OH$ group, the hydroxyl substituent is at $C-2.$ Therefore, the $\text{IUPAC}$ name is $2-$hydroxypentan$-3-$one.
Here, the principal functional group is carboxylic acid. The amino substituent is located at $C-3$ on four carbon chain. Therefore, the $\text{IUPAC}$ name $3-$aminobutanoic acid.
Here, two same functional groups are present at $C-1$ and $C-2$ position. They are indicated by using the term $‘di \ ’$ before the class suffix. Therefore, the $\text{IUPAC}$ name is propane$-1,2-$diol.
$iv. \ CH_2 = CH – CH = CH_2$
Here, the parent chain contains two double bonds at $C-1$ and $C-3,$ hence it is named as diene. Therefore, the $\text{IUPAC}$ name is buta$-1,3-$diene.
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