1.

The `IUPAC` name of the compound `CH_(3)underset(OH)underset(|)(CH)=CHCH_(2)COOH` isA. (1) hydroxypentenoic acidB. (2) `4`-hydroxypent-`3`-enoic acidC. (3) `4`-hydroxypent-`4`-enoic acidD. (4) `4`-hydroxy-`4`-methyl-`3`-enepentenoic acid

Answer» Correct Answer - B
The compound is an unsaturated carboxylic acid (alkenoic acid). The `C` of the `-CO_(2)H` group is always numbered `1`.
`overset(5)(CH_(3))underset("4-Hydroxypent-3-enoic acid")(underset(OH)underset(|)overset(4)(CH)=overset(3)CHoverset(2)CH_(2)overset(1)COOH`


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