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- 0.2 and 0.8 respectively
- 0.1 and 0.9 respectively
- 0.3 and 0.7 respectively
- 0.4 and 0.6 respectively
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- Explain briefly and clearly the following concepts, taking as reference the molecule of n-butane and the corresponding drawings or illustrations. See pages 149-152 of the book Organic Chemistry, sixth edition (J. G. Smith). 4. What is steric hindrance in a conformation? Then draw a picture to illustrate the concept? 5. What is the torsional stress of a conformation? Then draw a picture to illustrate the concept? 6. Describe 1,3-diaxial interaction and illustrate with a specific example.Why does the addition of bromine to fumaric acid require a high temperature for the reaction while other substrates (generic alkanes, alkenes, and alkynes) react with bromine at room temperature?Arrange according to melting temperature (highest to lowest). Arrange according to the tendency to solidify first as the temperature drops (slowest to fastest) Arrange according to the degree of unsaturation (highest to lowest). Which of the following has the highest iodine content? Which of the following has the lowest melting point? Which of the following requires the fewest moles of hydrogen for complete hydrogenation? Which of these is likely to be solid at room temperature?
- Give the name of the alkane using theIUPAC Rules.Using a secondary alcohol of your choice as an example: i)give the displayed formula of the product it could be oxidised to ii)state which homologous series the product belongs to iii)write a balanced chemical equation tor the reaction (the convention [O] may be used for the oxidising agent).1. What requirement should be provided to achieve high yield and high molecular weight of polymer by condensation reaction? 2. What is interfacial polymerization 3. Describe biopolymer and synthetic polymer. Give examples to support your answer 4. Briefly discuss the classification of polymers. 5. Why polymers are widely used in our daily life?
- A gaseous alkane is burned completely in oxygen. Thevolume of the carbon dioxide that forms equals twice thevolume of the alkane burned (the volumes are measured atthe same temperature and pressure). Name the alkane andwrite a balanced equation for its combustion.Below, write the names of 7 organic compounds whose open structures are given, and the open structures of 8 organic compounds that have been named according to the IUPAC naming system. (Consider also the case of R, S or E, Z.For a simple distillation, explain: a) what is the observed effect that chain length has on their boiling points? Explain why this trend is observed. b) compare the boiling points of the branched alkanes to that of hexane. what is the observed effect of branching on boiling points? explain why this trend is observed
- Chemistry Bromination of Stilbene In this experiment, we were going to brominate the carbon-carbon double bond of stilbene. The reaction conditions we were going to use to perform this reaction are considered “green” Describe why the procedure is “green.” Describe briefly how the Br2 adds to the double bond. Is the addition of Br2 to stilbene (or any alkene for that matter) anti-addition or syn-addition? What is the three-member ring that forms between the alkene and the Br2 called? Describe the differences between the Infrared spectra between the stilbene and the brominated product. Will the products that are produced be enentiomers of each other? Diastereomers of each other?Polymers can be cross-linked using a variety of reactions that create connections between different parts of the same polymer chain. Consider the repeat unit of the polystyrene derivative shown below.The homopolymer formed from this monomer has a low ceiling temperature (meaning it readily reverts to its monomers) and is unstable. It can be cross-linked by adding the terephthaloyl chloride (shown below) and AlCl3. Modify the structures provided to draw the result of the reaction of one repeat unit of the polymer with one unit of this cross-linking compound. Do not include lone pairs.In 1935, J. Bredt, a German chemist, proposed that a bicycloalkene could not have a double bond at a bridgehead carbon unless one of the rings contains at least eight carbons. This is known as Bredt’s rule. Explain why there cannot be a double bond at this position.