question_answer

IUPAC name of A is

A)  3 methyl 2 chloro butanoic acid

B)  2 methyl 3 chloro butanoic acid

C)  3 chloro 2 methyl butanoic acid

D)  2 chloro 3 carboxy, 2, 3-dimethyl propane

Correct Answer: C

Solution :

\[\because \] COOH is more senior than Cl. \[\therefore \] Numbering starts from COOH. \[Substituent\,\,\to \,\,\left[ \begin{matrix}    2-methyl  \\    3-chloro  \\ \end{matrix} \right.\] \[\operatorname{Parent} chain \to  butan\,\,-1-oic acid\] IUPAC name = 3 chloro-2-methyl butanoic acid