Which of the following compounds is wrongly named?

• A
  $CH_3-CH_2-CH_2-CH(Cl)-COOH$ $\rightarrow$ $2-$Chloropentanoic acid
• B
  $CH_3-C \equiv C-CH(CH_3)-COOH$ $\rightarrow$ $2-$Methylhex$-3-$enoic acid
• C
  $CH_3-CH_2-CH=CH-CO-CH_3$ $\rightarrow$ Hex$-3-$en$-2-$one
• D
  $CH_3-CH(CH_3)-CH_2-CH_2-CHO$ $\rightarrow$ $4-$Methylpentanal