Question: need help with these. will rate thanks 19-21. Predict the substrate for the reaction shown below. 22-24. Predict the product of the reaction sequence shown

need help with these. will rate thanks
 need help with these. will rate thanks 19-21. Predict the substrate

19-21. Predict the substrate for the reaction shown below. 22-24. Predict the product of the reaction sequence shown below. 25-27. Which is the best way to accomplish this synthesis? HCCH A (1) NaNH2 (2) (3) H+(4) H2Pd/BaSO4 (5) H2SO4 (conc.) Wheat B (1) NaNH2 (2) (3) H2/Pd/BaSO4 (1) NaNH2 (5) H2SO4 (conc), Wheat D (1) H2/Pd/BaSO4 (2) NaNH2 (3) (4) H+ (5) H2SO4 (conc.)/heat SECTION 3: Comprehensive write-in section. 1. Draw a detailed mechanism for electrophilic aromatic bromination of benzene (Xpts). 2. Draw a detailed mechanism for acid-catalyzed intermolecular dehydration of ethylene glycol, HOCH2CH2OH (Xpts). 3. Draw a detailed mechanism for Fisher esterification reaction between acetic acid and ethanol (Xpts)

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