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- Which of the following are consistent with the requirements for aromaticity?I. A system with delocalized p electrons in a ring.II. 4n p electrons in the ring.III. All the ring atoms must be carbons.IV. (4n + 2) p electrons in the ring. Give the answer why.what aromatic annulene has the same number of bond molecular orbital as the hypothetical all cis (20) annuleneAromatic compounds also known as arenes or aromatic are chemical compounds that contain conjugated planar ring system with delocalized pi electron clouds instead of discrete alternating single and double bond. One of the precursor to produce aromatic compounds is arenediazonium.Critize this statement
- Aromatic heterocyclic chemistry: State whether the following drugs are aromatic heterocycles and if they follow the 4 aromaticity rules (unsaturation, (4n + 2)pi electrons, cyclic and flat/planar), NAME ANY HETEROCYCLES. Draw the structure of the core of any aromatic heterocycles in the drug. Riociguat, Imatinib, Clopidogrel, Glatiramer acetate, AxitinibWhich of the following statements is FALSE? Select one: a. Aromatics are compound that are conjugated. b. The Cs and Hs in an aromatic compound are equivalent. c. The pi electrons are delocalized around an aromatic ring. d. None of the statements is false.Use the inscribed polygon method to show the pattern of molecularorbitals in cyclooctatetraene. Indicate the arrangement of electrons in these orbitals forcyclooctatetraene, and explain why cyclooctatetraene is not aromatic.
- 5Thiamin, or vitamin B1, contains a positively charged five-memberednitrogen–sulfur heterocycle called a thiazolium ring. Explain why the thiazoliumring is aromatic.Use the inscribed polygon method to show the pattern of molecular orbitals in cyclonona-1,3,5,7-tetraene, and use it to label its cation, radical, and anion as aromatic, antiaromatic, or not aromatic.Is this molecule aromatic? Why doesn't the pi bond in the benzene ring on the left side not count torward aromaticity?
- Use the inscribed polygon method to show the pattern of molecularorbitals in cyclonona-1,3,5,7-tetraene, and use it to label its cation,radical, and anion as aromatic, antiaromatic, or not aromatic.Biphenyl has the following structure.(a) Is biphenyl a (fused) polynuclear aromatic hydrocarbon?(b) How many pi electrons are there in the two aromatic rings of biphenyl? How does this number compare with that for naphthalene?(c) The heat of hydrogenation for biphenyl is about 418 kJ>mol (100 kcal>mol). Calculate theresonance energy of biphenyl.(d) Compare the resonance energy of biphenyl with that of naphthalene and with that of two benzene rings. Explain thedifference in the resonance energies of naphthalene and biphenyl.For heterocycles containing nitrogen atoms, determine whether nitrogen’s lone pairs are used in the aromatic system, and predict whether the nitrogen atom is strongly or weakly basic.