11. Which diene would react the fastest in a Diels-Alder reaction? 16. What is t

Question

11. Which diene would react the fastest in a Diels-Alder reaction? 16. What is the molecular formula of the major (a) CH4O2 b) CeHoO (c) CoHoO (d) CaH (e) None of these. 12. Diazonium ions are often synthesized at 17. Which of the tollowing is a product of the low temperatures, why? (a) They react very quickly (b) They evaporate very easily (c) They can be explosive (d) They can form a red dye if warmed (e) They decompose at high temperatures above reaction? 18. What is the product of the following reaction? 13. The p-ni reacts with KI to produce? (a) p-nitrophenol. (b) p-nitrobenzoic acid. (c) Nitrobenzene. (d) p-lodonitrobenzene (e) None of the above ON al 14. Which is an untrue statement about the Diels-Alder reaction? (a) It is a syn addition (b) The diene must be in the s-cis conformation to react (o) Most Diels-Alder reactions are 19. 24 mL of Benzaldehyde (MW- 106 g. (d) Electron donating groups on the diene allow for a faster reaction. d-1.04 g/mL) treated with KCN under reflux. What is the theoretical yield (nearest gram) of benzoin (mw 212 g) for the reaction? (e) The exo product is usually the fastest (a) 50g (b) 13 g (c) 25g (d) None of these Questions 15-17 are based on the following reaction. 20. 16 grams of benzoin was obtained from the reaction in question 19. What is the peroent yield of the reaction? Heat Products) (c)80% (d)62% (a) 64%(b) 15% products can be formed (DO NOT include isomers)? 15. In the above reactions, how many (a) 2 (b) 3 (c)5 (d)4 (e) 8

Explanation / Answer

11) optin D reacts faster in Diels-Alder reaction.

Explanation: -OCH3 is an electron donating group which increases electron density on diene and inreases reactivity of diene in Diels-Alder reaction.

12) Diazonium ions are synthesized at low temperature because at high temperature they decompose. option E is correct.

13) option D is correct

Explanation: KI reacts with diazonium cation to form iodo product.

14) The untrue statement is option E.

Explanation: endo product is formed at faster rate.

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