A reaction mixture, in an organic solvent, contains an organic acid, an organic base, neutral organic compounds, and base containing impurities. The organic solvent is treated completely with NaOH(aq), followed by removal of the water layer. The organic layer then undergoes complete treatment with HCl(aq). What is left in the organic layer after this treatment?a. organic base b. neutral organic compounds c. organic acid d. base containing impurities