6) The siructure originelly proposed For Cordycepic acid, [a], + 40.3', has been shown to be in Correct, suggest %3D reason to be skeptical obout the original Structure, which CO2H is given below HO HO.
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- Following is a structural formula for guanidine, the compound by which migratory birds excrete excess metabolic nitrogen. The hydrochloride salt of this compound is a white crystalline powder, freely soluble in water and ethanol. Q. Does proton transfer to guanidine occur preferentially to one of its -NH2 groups (cation A) or to its =NH group (cation B)? Explain.Describe the trends in the acidityand physical properties of carboxylicacids, and explain how their acidityvaries with their substituents.A compound X is bitter in taste. It is a component of washing powder& reacts withdil. HCI to produce brisk effervescence dur to colourless, odourless gas Y wich turns lime water milky due to formation of Z. When excs of CO2is passed, ilkinessdisappears due to formation of P. Identify X, Y, And Z & P.
- Complete and balance the following:(a) H2S(g) + O2(g)→(b) SO3(g) + H2O(l) →(c) SF4(g) + H2O(l) →(d) Al2Se3(s) + H2O(l) →Arrange the following with respect to decreasing reactivity to SN1The compound acetophenone has a very similar molar mass to that of benzoic acid and benzamide. However, acetophenone has a much lower m.p. (20 °C) than both such that, by contrast, it is a liquid at room temperature. By considering intermolecular forces and comparing functional group structure, account for this big difference in physical properties.
- The molecular formula of unknown compound B is C10H16.Quantitative brominationof a 0.473-g sample of compound Brequired 48.22mL of a 0.216MBr2/CCl4to produce a color change. How many rings and pi bonds does compound Bcontain?Include any explanations/calculations to justify your answers.The cyclobutenyl dichloride below reacts with the powerful Lewis acid antimony pentafluoride in liquid SO2 at -75o to give a pale yellow solution that exhibits one singlet at 3.68 ppm in its 1H-NMR spectrum. The species in solution has been deduced to be the salt C8H12X2 where X is an hexahaloantimonate anion. Draw the cation part of the salt C8H12X2Compound A, C5H10O, is one of the basic building blocks of nature. All steroids ans many other naturally occurring compounds are built from compound A. Spectroscopic analysis of A yields the following information. a) how many double bonds and/or rings does A have? b) From the IR spectrum, what is the identity of the oxygen-conataining functional group? c) what kinds of protons are responsible for the NMR absorptions listed d) propose a structure for A