January 2021

i.            Offer an explanation of why 2,2,2-trifluoroacetic anhydride is more reactive toward aniline than acetic anhydride in the nucleophilic acyl substitution reaction presented in this experiment. ii.            Offer a reasonable explanation of why acetamide has a higher melting and boiling point then N,N-dimethylacetamide even though it has a lower molecular weight: iii. Outline a simple […]

i.            Explain why the 25% NaOH solution is added to the reaction mixture. ii.            Draw a structure to illustrate the hydrogen bonding that may occur when two polymer molecules of this polyamide are cold – drawn together. iii.            Predict the structure of the polymer that would result in the condensation of the following reactants. These

i.            What starting materials would you use to prepare each of the following compounds by the Diels–Alder reaction? ii. Diels–Alder reactions with benzene are rare, and require a very reactive (electron-deficient) dienophile, because benzene is a rather unreactive diene. Two are shown below. Give the structures of the product produced in each reaction. iii. Shown

i.            Alkynes can be hydrated in the presence of acid and HgSO4 by electrophilic addition of a molecule of water to the triple bond. The reaction proceeds by way of a carbocation intermediate. Hydration of acetylene (ethyne) produces acetaldehyde (ethanal). Outline the steps that occur in this transformation. ii.            Use the IR tables (online and Chapter

i.            1,2-Dicarbonyl compounds, such as benzil, can be characterized by reaction with o-phenylenediamine to form a substituted quinoxaline: (a)    Write the structure for the quinoxaline derivative obtained when benzil is the reactant. Do you think this compound would be colored? If so, why? (b)   Suggest a suitable mechanism for the formation of the quinoxaline compounds

A. Based on the expected value of the net cash inflows, which project should be undertaken? (A) L (B) M (C) N (D) O (E) P. B. The value of perfect information about the state of the market is (A) Nil (B) £5,000 (C) £26,000 (D) £40,000 (E) £128,000. The following data relates to both Questions

XYZ manufactures a product called the X. During recent months the X has been sold at a unit price of around £6.25, with small adjustments to this price being made in order to try and find a profit-maximizing selling price. Consultants engaged by XYZ have reported that at a unit price of £10 there is

A.Which of the following are required to determine the breakeven sales value in a multiproduct manufacturing environment? (i) individual product gross contribution to sales ratios; (ii) the general fixed cost; (iii) the product-specific fixed cost; (iv) the product mix ratio; (v) the method of apportionment of general fixed costs. (A) (i), (ii), (iii) and (iv)

A. T plc has developed a new product, the TF8. The time taken to produce the first unit was 18 minutes. Assuming that an 80% lerning curve applies, the time allowed for the fifth unit (to two decimal places) should be (A) 5.79 minutes (B) 7.53 minutes (C) 10.72 minutes (D) 11.52 minutes. Note: For

In a TQM environment, external benchmarking is preferred to standard costing as a performance measurement technique because: (A) standard costs quickly become obsolete; (B) TQM emphasises continuous improvement and reference to a predetermined internal standard gives no incentive to improve; (C) TQM places an emphasis on employee empowerment, and the concept of a standard cost