Which atom is bonded to the carbon atom in the functional group of a ketone? (1) fluorine (3) nitrogen
(2) hydrogen (4) oxygen

I think oxygen bonded to the carbon atom in the functional group of ketone so the answer is (4) oxygen :))
i hope this be helpful

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.