Before revision: Carbochemistry is the branch of chemistry that studies the transformation of coal- (bituminous coal, coal tar, anthracite, lignite, graphite, and charcoal) into useful products and raw materials.
After revision: Carbochemistry is the branch of chemistry that studies the transformation of coal (bituminous coal, coal tar, anthracite, lignite, graphite, and charcoal) into useful products and raw materials.