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- a) Which molecule has a higher electron density in the aromatic ring? Explain. H₂C O CO₂H CO₂H H₂C-N CH3 CH3 b) which is more acidic?Cyclopentadienyl anion (shown) has the following characteristic. O it is an anion with six π electrons, meeting the Hückel rule for aromaticity O it is not aromatic because it has only four electrons and the tetrahedral carbon prevents cyclic conjugation O it is an anion with six electrons, meeting the Hückel rule for anti-aromaticity O it is an anion with four electrons, meeting the Hückel rule for aromaticityConsider the tetracyclic aromatic compound drawn below, with rings labeled as A, B, C, and D. (a) Which of the four rings is most reactive in electrophilic aromatic substitution? (b) Which of the four rings is least reactive in electrophilic aromatic substitution? (c) What are the major product(s) formed when this compound is treated with one equivalent of Br2?
- This structure is considered to have 'anti-aromatic character'. Using the provided resonance structures, draw the curved electron-pushing arrows to show the interconversion between resonance hybrid contributors. Be sure to account for all bond-breaking and bond-making steps. :0: Select to Add Arrows :0: I I I IDefine the below statement ? Benzene's six π electrons make it electron rich, so it reacts withelectrophiles.Which structure is NOT aromatic? H,C
- Of the following compounds, + are aromatic. +Compound A and compound B are in equilibrium. Write a stepwise mechanism from compound Ato compound B showing ALL intermediates. Use curved arrows to symbolize the flow of electrons to show how each of the intermediates and products are formed. Show all lone pairs and formal charges. Lastly, explain which compound (Aor B) will be in higher concentration.An aromatic hydrocarbon with a molecular formula of C13H20 has an 1H NMR spectrum with a signal at ~7 ppm that integrates to 5H. It also has two singlets; one of the singlets has 1.5 times the area of the second. What is the structure of the aromatic hydrocarbon?
- Borole is a particularly unique heterocycle that has gained considerable attention in recent years for its peculiar reactivity. Draw a molecular orbital diagram for the pi system of borole (including the placement of its pi electrons) and provide an analysis of its aromaticity using Hückel's rule denoting whether borole is in fact aromatic, antiaromatic, or nonaromatic. H BoroleLabel each compound as aromatic, antiaromatic, or not aromatic. Assume all completely conjugated rings are planar.Choose the more basic of each of the following pairs Explain the reason of your choice.