A) pentanone-2
B) pentan-2-one
C) 2-pentanone
D) All of these
Correct Answer: B
Solution :
\[\overset{5}{\mathop{C}}\,{{H}_{3}}\overset{4}{\mathop{C}}\,{{H}_{2}}-\overset{3}{\mathop{C}}\,{{H}_{2}}\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{\overset{2}{\mathop{C}}\,}}\,-\overset{1}{\mathop{C}}\,{{H}_{3}}\] The position of the keto group may be indicated by any of the three ways: Pentanone-2 or 2-pentanone or pentan-2 one. However, according to the latest IUPAC convention. While naming the organic compound, the locants (numerals and/or letters) are placed immediately before the part of the name to which they relate. Therefore, the name of the given organic compound is pentan-2-one.
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