Choose the right reagent or series of reagents from the ones listed below to prepare 2-pentanone from acetylene.  NaNH2NaNH2 followed by CH3CH2CH2BrCH3CH2CH2Br, then disiamylborane followed by H2O2H2O2, HO−HO− H2H2, Lindlar followed by H2OH2O, H+H+ NaNH2NaNH2 and CH3CH2CHOCH3CH2CHO NaNH2NaNH2 followed by H2OH2O, H+H+ NaNH2NaNH2 followed by CH3CH2CH2BrCH3CH2CH2Br, then H2OH2O, H2SO4H2SO4, HgSO4 Choose one.

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A: Which one of the following is correct

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Q: HO НО

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Q: 4. Determine the appropriate reagents to achieve the following transformations. 요 Η Ph Ph Η

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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.