Answer
The name of the compound is:
$5-methyl-3-hexanone$
Work Step by Step
The compound has the general formula $RCOR$. It is a ketone. The longest continuous carbon chain has 6 carbon atoms. There is a methyl substituent at position 5 and the carbonyl group is at position 3. Hence, the name of the compound is
$5-methyl-3-hexanone$.