IUPAC name is

The longest carbon chain first here in given structure it is of five carbons which we called pentane, now give preferences to functional groups so the ketone group get priority than halogen so the ketone group goes with parent chain and other groups will be count as substituents in above structure bromine is present at 1 position and methyl group present at position 3 then the main functional group ketone is present at position 2, so name it in alphabetic order.