Answer and Explanation:
The Fremy salt is a chemical compound its chemical name is disodium nitrosodisuphonate
The molecular formula of the Fremy salt is [tex]K_2NO(SO_3)_2[/tex]
When phenol is treated with Fremy salt in presence of water then benzoquinone is formed
[tex]C_2H_5OH\rightarrow C_6H_4O_2[/tex] ( in presence of Fremy salt and water)