G on heating at high temperature gives _________ .

A white coloured compound A on heating gives a gas C and a solid residue B. C on reaction with RMgX gives carboxyilic acid. B on reaction with water gives D which on reaction with H₂O₂ gives E through formation of an intermediate compound. E on reaction with dil. HCl gives F and hydrogen peroxide. F is used for removing ice on the roads. F on reaction with sulfuric acid gives G and an acid.