Organic Chemistry Basics 1 Question 4
4. The IUPAC name of the following compound is
(a) 4,4 - dimethyl -3-hydroxybutanoic acid
(2019 Main, 8 April I)
(b) 2-methyl-3-hydroxypentan-5-oic acid
(c) 3-hydroxy-4-methylpentanoic acid
(d) 4-methyl-3-hydroxypentanoic acid
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Answer:
Correct Answer: 4. (a)
Solution:
- The IUPAC name of the given compound is 3-hydroxy-4-methylpentanoic acid.
Principal chain While naming the compound, the longest chain that have principal functional group $-\mathrm{COOH}$ is choosen and numbered in such a manner that the principal functional group gets the lowest possible number. - $\mathrm{OH}$ act as substituent and used as prefix in nomenclature.
