question_answer

The IUPAC name of \[OCH-C{{H}_{2}}-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-COOH\] is

A)  1-formyl-3-oxopentanoic acid

B)  5-formyl-3-oxopentanoic acid

C)  3-oxo-5-formylpentanoic acid

D)  3-oxo-1-formylpentanoic acid

Correct Answer: B

Solution :

                \[OHC-\underset{5}{\mathop{C}}\,{{H}_{2}}-\underset{4}{\mathop{C}}\,{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{\underset{3}{\mathop{C}}\,}}\,}}\,-\underset{2}{\mathop{C}}\,{{H}_{2}}-\underset{1}{\mathop{C}}\,OOH\]Carboxylic group is given priority over \[-CHO\] and  group. Hence, its IUPAC name is 5-formyl-3-oxo-pentanoic acid.