If a compound G is reported in the literature as a pale yellow solid and when dissolved hot to purify by crystallization, the resulting solution is yellow, should the red decolorizing carbon be used before allowing the hot solution to cool? Explain
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If a compound G is reported in the literature as a pale yellow solid and when dissolved hot to purify by crystallization, the resulting solution is yellow, should the red decolorizing carbon be used before allowing the hot solution to cool? Explain
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- Briefly explain (in one or two sentences) the following observations:a. Unlike NH3, BiH3 is very unstable compound.b. Solid SO3 forms a trimer (SO3)3 but solid SeO3 forms a tetramer (SeO3)4.c. NH3 can be obtained from N2 and H2, but PH3 has to be prepared from PCl3 and LiAlH4Describe with a suitable example why the characterisation of chiral compounds is important to the pharmaceutical industry and indicate why separation of the enantiomers can prove challenging. Explain how capillary electophoresis can be used in the analysis of these compounds.Diisopinocampheylborane (Ipc2BH) is a chiral organoborane, readily employed for the production of many asymmetric products used in total synthesis. It is a crystalline material that can be prepared as a single enantiomer via the hydroboration of two equivalents of α-pinene with borane.Explain why only one enantiomer of Ipc2BH is formed.
- Butan-1-ol can be oxidised by acidified potassium dichromate( VI) using two different methods. (a) In the first method, butan-1-ol is added dropwise to acidified potassium dichromate( VI) and the product is distilled off immediately. (i) Using the symbol [O] for the oxidising agent, write an equation for this oxidation of butan-1-ol, showing clearly the structure of the product.State what colour change you would observe. Equation ........................................................................................................... Colour change .................................................................................................. (ii) Butan-1-ol and butan-2-ol give different products on oxidation by this first method. By stating a reagent and the observation with each compound, give a simple test to distinguish between these two oxidation products. Reagent…If bromine water is shaken with a liquid hydrocarbon such as cyclohexane, the red/orange bromine water fades and the cyclohexane becomes bright orange/red in colour. Explain this observationThe isomers prepared were of [Dichlorobis(ethylenediamine)cobalt(III)] Chloride
- A sample of a saccharide turns dark blue with subjected to the starch iodine test. What does this result indicate about the saccharide?Give the structure of compound 5 and compound 6An organic chemist was subjected to sodium fusion and the resulting lassaigne's extract boiled with FeSO4 and acidified with concentrated H2SO4, yielding a prussian blue color. Give the structure of one of the organic compounds which fits the description.
- An organic compound (A) was heated with a solution of NaOH. The resulting solution was cooled, acidified with dilute HNO3, and then AgNO3 solution was added. This gave a white precipitate. The compound (A) may be a. benzoic acid b. toluene c. benzyl chloride d. phenyl chlorideProvide an explanation for this order of reactivity.Compound K, L and M are three isomers with the molecular formula C5H10O.Compound K cannot be oxidized, while compound M and L can be oxidized.Oxidation of compound L with hot acidified potassium permanganate,KMnO4 solution yields 2-methylbutanoic acid. When treated with Iodoformreagent, yellow precipitation only occurs in compound K. Fehling test onlyyielded positive results for compound L and negative for compound M andK. Compound M is then reacted with hydrogen chloride, HCl produceschlorocyclopentane