Here we include as many -CHO groups as possible in the longest chain.Thus it is numbered as above (to give lowest possible number to the substituents -CH2−CHO). This group is named formylmethyl.
6 carbons = hex.
Since there are no carbon - carbon multiple bonds, primary suffix = ane; secondary suffix = dial.
Hence the IUPAC name is
(a) 3 -(Formylmethyl)hexanal
Note the parentheses indicating substituted substituent.
The compound could also be named 3-propylpentanedial
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