Reaction of Compound 1 (C3H9SBr) with one molar equivalent of sodium acetylide ( HC=CNa) in CH2C12 (this is a polar aprotic solvent, it does NOT participate in the mechanism for this reaction) leads to Compound 2, C,H10S and sodium bromide (NaBr). C4HgSBr HCECNA HC=C + NaBr Compound 1 CH,Cl2 CH3 C6H10S Compound 2 a) Did this substitution reaction proceed via SN1 or Sn2 mechanism? Justify your answer. b) Draw the structure of Compound 1(with proper stereochemistry) and label R/S where necessary and state if Compound 1 is optically active. c) Label R/S where necessary for Compound 2 and state if Compound 2 is optical activity.

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Q: Provide the mechanism for the following transformation. D = 2H

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A: This is an example of electrophilic aromatic substitution reaction

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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.