20. Starting with benzene, the best method for preparing para-nitrobenzoic acid is:
(A) HNO3/H2SO4; then CH3CI/AlCl3; then separation of isomers; then KMnO4/-OH/heat, followed by H3O+.
(B) CH3CI/AICl3; then HNO3/H2SO4; then separation of isomers; then KMnO4/-OH/heat, followed by H30t.
(C) CH3CI/AICl3; then KMn04/-OH/heat, followed by H3O+; then HNO3/H2SO4.
(D) HNO3/H2SO4; then KMnO4/-OH/heat, followed by H3O+; then CH3CI/AICl3.
(E) HNO3/H2SO4; then CO2, followed by H3O+.

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統計: A(0), B(0), C(1), D(0), E(0) #3224474

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