Naphthalene-1,4-dione, also known as 1,4-naphthoquinone, is an organic compound consisting of a naphthalene core structure with two ketone functional groups at the 1 and 4 positions. It is an orange crystalline solid that sublimes readily. Naphthalene-1,4-dione is weakly soluble in water but highly soluble in organic solvents like alcohol, acetone and ether. As a 1,4-dihydroxy aromatic compound, it possesses electrophilic reactivity associated with the ketone groups.