An organic compound (A) of molecular formula C7H8O on oxidation with alkaline KMnO4 gives (B) of formula C7H6O. (B) on reaction with CI2 in the presence of catalyst FeCl3 gives (C) of formula C7 HOCl. (B) on reaction with CI2 in the absence of catalyst gives C7H5OCI. Identify A,B, C,D and explain the reaction involved.
