77a) From benzene get m-nitrobenzoic acid. Enter this compound into a reaction with phosphorus pentachloride, and then with the sodium salt of propionic acid. Give the names of all organic compounds obtained.
b) Write the reaction equations for the interaction of potassium phenolate with propionic acid anhydride; with hydrochloric acid, and then with 1 mol of concentrated sulfuric acid when heated. What is the name of the resulting product?

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