Alkynes acidic character addition reactions and polymerization - Question Bank
1. The polymerization of ethyne to polyacetylene is a type of:
2. Acid-catalyzed hydration of internal alkynes like 2-butyne yields:
3. The conversion of an alkyne to a trans-alkene can be achieved by using:
4. The addition of one mole of HBr to 1-butyne follows Markovnikov's rule and produces:
5. Which of the following terminal alkynes is the most acidic?
6. The reaction of ethyne with dilute nitric acid and mercuric nitrate yields:
7. Which of the following is a property of the sp hybridized carbon atom in alkynes?
8. The polymerization of alkynes can be catalyzed by:
9. Ozonolysis of 2-butyne followed by workup yields:
10. The reaction where an alkyne is converted to a cis-alkene using a poisoned palladium catalyst is known as:
11. The addition of H2O to 1-butyne in the presence of HgSO4 and dil. H2SO4 will yield:
12. The formation of a precipitate with ammoniacal silver nitrate solution is a test for:
13. When ethyne reacts with one equivalent of Br2, the product is:
14. Which statement is FALSE regarding the acidic character of alkynes?
15. Reaction of acetylene with hot concentrated nitric acid results in the formation of:
16. Which of the following is a consequence of the sp hybridization of carbon atoms in alkynes?
17. The polymerization of ethyne can produce conjugated polymers with interesting electronic properties.
18. The ozonolysis of propyne followed by reductive workup yields:
19. Which catalyst is used for the complete reduction of alkynes to alkanes?
20. The reduction of an alkyne with Na/NH3 (liquid) yields a mixture of cis and trans alkenes.
21. The anti-Markovnikov addition of water to alkynes is achieved by:
22. What is the intermediate formed during the hydration of ethyne before tautomerization?
23. The reaction of ethyne with dilute H2SO4 and HgSO4 is an example of:
24. Which of the following can be synthesized using the alkylation of terminal alkynes?
25. The structure of the acetylide ion formed from ethyne is:
26. The rate of deprotonation of alkynes with a base increases in the order:
27. Which type of bond is broken during the addition of HBr to ethyne?
28. The product of the reaction of propyne with NaNH2 followed by CH3I is:
29. Which of the following is a characteristic reaction of terminal alkynes that distinguishes them from internal alkynes?
30. The reaction of ethyne with hot concentrated sulfuric acid leads to:
31. The acidic hydrogen in ethyne can be replaced by:
32. Which of the following conditions favors polymerization of alkynes?
33. Polymerization of ethyne leads to the formation of:
34. Ozonolysis of ethyne followed by reductive workup yields:
35. Dissolving metal reduction (e.g., Na in liquid NH3) of an alkyne yields:
36. Which catalyst is used for the partial reduction of alkynes to cis-alkenes?
37. The reaction of ethyne with hydrogen gas in the presence of a catalyst like Pd/BaSO4 (Lindlar's catalyst) produces:
38. Hydroboration-oxidation of a terminal alkyne results in the formation of:
39. The hydration of an unsymmetrical alkyne like propyne follows Markovnikov's rule, leading to the formation of a(n):
40. Addition of H2O to ethyne in the presence of HgSO4 and dil. H2SO4 yields:
41. The addition of halogens (e.g., Br2) to alkynes follows:
42. When ethyne reacts with excess HBr, the product formed is:
43. Which of the following is NOT a product of the addition of HBr to ethyne?
44. The reaction of a terminal alkyne with a strong base like NaNH2 followed by an alkyl halide (R-X) is an example of:
45. Terminal alkynes can react with heavy metal ions like silver (Ag+) and copper(I) (Cu+) to form:
46. Which of the following reactions demonstrates the acidic character of alkynes?
47. The conjugate base of ethyne is called:
48. Which reagent is commonly used to deprotonate terminal alkynes?
49. The acidic nature of terminal alkynes is due to:
50. Which of the following is the most acidic alkyne?