Yes, QUINONE is a Scrabble word!

Letter values in Scrabble US: Q 10, U 1, I 1, N 1, O 1, N 1, E 1.

Is it a valid word?

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

any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes

Not playable in Scrabble US: BENZOQUINONE.