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- Which among the following statements best explains the purpose that sulfuric acid serve in the nitration test for aromaticity? A. a protecting group to prevent over-nitration B. a source of electrophiles to activate the aromatic ring for nitration C. a catalyst to convert nitrate to nitrite ion D. a temporary electrophile followed by its replacement with nitronium ion E. a catalyst to convert nitrate to nitronium ion Kindly explain your answer.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.Based on the following H NMR and IR spectrums, what is the structure of C7H6N2?
- 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.Consider the tetracyclic aromatic compound drawn below, with rings labeled as A, B, C, and (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 produces) formed when this compound is treated with one equivalent of Br2?For the following reaction scheme, identify by drawing the reagents b and d and the intermediate c that are formed in the synthesis of benzoic acid.
- . Identify the aromatic compound which cannot undergo the Friedel-Crafts reaction with CH3Cl/AlCl3.Borazole, B3N3H6, is an unusually stable cyclic compound. Propose a structure forborazole, and explain why it is aromatic.1) How will you describe whether any compound has been oxidized or reduced? Support the answer with suitable examples. 2)Why carboxylic acid with a carbonyl group at 3rd position can be decarboxylated? 3) Explain why electrophilic aromatic substitution in Pyrrole takes place at C-2 positions whereas, in Pyridine it takes place at C-3 position? 4) List the following esters in order of decreasing reactivities towards hydrolysis with reason: Methyl benzoate, p-cyano methyl benzoate and p-hydroxy methyl benzoate 5)LDA is the base of choice for carbonyl compound to completely convert into enolate. Why?