Propose an efficient synthesis for the following transformation. d-he The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order, as a string of letters (without spaces or punctuation, such as "EBF). If there is more than one correct solution, provide just one answer. A t-BuOK E conc. H₂SO4, heat 1 1) R₂BH; 2) H₂O₂, NaOH B HBr. ROOR F H₂SO4 H₂O, HgSO4 J Mel C EtONa G 1) 0:2) DMS K HCECNa D HBr H 1) xs NINH,:2) HO L Br, hv

Q: Select the first step in the following reaction. оват нө о-н н“ OMe нө О-Н н“: H30 MeO А MeO ОН

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Q: II NO₂ III NH₂ IV CN VI H NH₂

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Q: 1000 CHET AC4 הידיים 106

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Aromatic Compounds

Aromatic organic compound or aromatic system is an important class of hydrocarbons under the branch of organic chemistry. Aromatic compounds are also called arenas. The definition of aromatic organic compounds can be stated as a class of organic compounds with a planar cyclic ring of atoms bonded through alternated single and double bonds. Due to these alternating bonds, a peculiar feature termed as ‘resonance’, that is, delocalization of pi electrons or the electrons is shared within the atoms of the ring which are present in the aromatic compounds. The word ‘aromatic’ includes a Greek word ‘aroma’ which means smell, indicating that they were named as such due to the sweet odor they produce. Many well-known flavors such as vanilla, cinnamon, and few scents from flowers are extracted from aromatic compounds. Benzene with chemical formula C6H6 is a very common aromatic compound that contains six atoms of carbon held in the cyclic ring of alternate double bonds. It is also to be noted that not all aromatic compounds contain benzene ring. This can be explained by Huckel’s rule.