Solution :
$$-CHO$$ group gets higher priority over $$ > C = O$$ and group in numbering of principal carbon chain.
$$IUPAC{\text{ name}} = 3 - keto - 2 - methylhex - 4 - enal{\text{.}}$$
Releted MCQ Question on Organic Chemistry >> General Organic Chemistry
Releted Question 1
The bond order of individual carbon-carbon bonds in
benzene is