Answer Happy

Would appreciate help on questions 22,23 and 24. Thank you in
advance!
21. For the following molecule classify it is as aromatic, antiaromatic, or nonaromatic, and identify the best supporting explanation. H N A. B. C. aromatic;cylic conjugated system with Hückel's number of pi electrons antiaromatic; It only has 4 pi bonds nonaromatic; there is not a continous system of pi electrons due to the NH antiaromatic; the compound has 4n pi electrons D. E. aromatic; there is a p orbital on every atom in the rings 22. Identify the expected major product of the following reaction. Na₂Cr₂O7/H₂SO4/H₂O ? excess ‡‡¢¢ 11 A. B. II C. III D. IV E. V 23. Identify the structure of intermediate A expected from the following reaction sequence. NBS 1. BH, PCC t-BUOK A B C 2. H₂O-/NaOH ABCDE OH A. IV II C. III D. IV E. V 24. Identify the expected major product of the following reaction. Na, CH₂OH NH3 HO. IV A. I B. II C. III D. IV E. V 25. What is the mechanism by which benzene reacts with bromine? A. B. C. D. E. 40. I 10. III ? Unimolecular nucleophilic addition Electrophilic aromatic addition Electrophilic aromatic substitution Biomolecular nucleophilic substitution Aromatic nucleophilic substitution