21. In the following reaction, what is reagent (a) I and IV (b) IV only (c) ll a

Question

21. In the following reaction, what is reagent (a) I and IV (b) IV only (c) ll and IV (d) ll and 26. Which of these dienes can undergo a Diel-Alder reaction? 1, HCI, HONO 2. Reagent? NH2 27. Which of the following will undergo racemization when treated with base? (a) CuCN (c) NaOH, H20 (b) 2-Naphthol, NaOH (d) H2SO4,H20, heat b) 22. The product of step 1 in the above reaction is heated with HaSO, H:O. What is the product? (a) Toluene tb d (b) p-methylphenol (c) 1,4-dimethylbenzene 28. N,N-dimethylaniline and the diazonium (d) Para-red (e) None ot the above salt of p-nitroaniline react via what mechanism? (a) Nucleophilic aromatic substitution (b) Electrophilic aromatic substrution (c) Nucleophilic addition (d) Electrophilic addition (e) None of the above 23. Oxidation of Benzoin using concentrated nitric acid produces a red brown gas called. (a) Bromine (b) Carbon monoxide (c) Sulfur oxide (d) Nitrogen oxide (e) None of the above 29. LDA is base often used to generate the enolate anion of aldehydes and ketones. What product is formed below? 1. LDA Why is the aldol condensation step in experiment 3 heated to 100 °C? (a) To melt the reactants (b) To eliminate the need for base (c) To decrease the yield (d) To drive in the equilibrium forward (e) None of the above 24. Select the structure(s) of the conjugated diene(s) 25. mportant to have only one reactant with alpha-hydrogens, why? (a) To increase the reaction rate (b) To decrease side product formation (c) To decrease the reaction rate (d) To avoid heating the reaction (e) None of the above 30. In an aldol condensation reaction it is

Explanation / Answer

21.b

22.b

23.d

24.b

25.d

26.a,d

27.d

28.b) electrophilic aromatic substitution

29.a

30.b)to decrease side product formation

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