Yes, KETONE is a Scrabble word!

Letter values in Scrabble US: K 5, E 1, T 1, O 1, N 1, E 1.

Is it a valid word?

KETONE is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

any of a class of organic compounds having a carbonyl group linked to a carbon atom in each of two hydrocarbon radicals