Alkenes electrophilic addition Markovnikov and peroxide effects and polymerization - One Line Questions

1. The product formed by the addition of HBr to 1-phenylpropene according to Markovnikov's rule is: — 2-bromo-1-phenylpropane
2. The product formed by the anti-Markovnikov addition of HBr to 2-methylbut-1-ene is: — 1-bromo-2-methylbutane
3. When HBr is added to propene in the presence of peroxides, the major product formed is: — 1-bromopropane
4. The addition of Br2 to ethene forms: — 1,2-dibromoethane
5. The addition of Br2 to propene in the absence of peroxides yields: — 1,2-dibromopropane
6. The product formed by the addition of HBr to 2-methylbut-2-ene according to Markovnikov's rule is: — 2-bromo-2-methylbutane
7. The intermediate in the free radical addition of HBr to an alkene involves the formation of: — A carbon radical
8. Polymerization of ethene to polythene is an example of which type of polymerization? — Addition polymerization
9. In the free radical addition of HBr, the chain propagation step involves: — Attack of Br• on the alkene
10. Which of the following initiators is suitable for free radical polymerization? — Benzoyl peroxide
11. The addition of H2O to but-1-ene in acidic medium yields: — Butan-2-ol
12. The addition of H2O to but-2-ene in acidic medium yields: — Butan-2-ol
13. The mechanism of addition polymerization of alkenes usually involves: — All of the above
14. The intermediate formed in the electrophilic addition of HBr to propene is a: — Carbonium ion (carbocation)
15. In the free radical polymerization of alkenes, the chain termination step can occur by: — Both a and b
16. Which type of polymerization is commonly used for monomers with double bonds? — Addition polymerization
17. The reaction of an alkene with halogens in the presence of water leads to the formation of: — Halohydrins
18. The addition of HBr to propene in the presence of organic peroxides follows which mechanism? — Free radical addition
19. In the addition polymerization of alkenes, the monomer units are joined together by: — Formation of new sigma bonds
20. Which of the following alkenes can undergo addition polymerization? — Ethene
21. Which of the following alkenes will give a mixture of products in the electrophilic addition of HBr due to the formation of a more stable carbocation? — But-1-ene
22. According to Markovnikov's rule, in the addition of an unsymmetrical reagent like HBr to an unsymmetrical alkene, the hydrogen atom of the reagent attaches to the carbon atom that has: — More hydrogen atoms
23. Which of the following is a characteristic of addition polymerization? — Monomers combine without loss of atoms
24. Which type of reaction is the addition of HBr to an alkene in the absence of peroxides? — Electrophilic addition
25. The addition of water to an alkene in the presence of an acid catalyst is an example of: — Electrophilic addition
26. The peroxide effect is observed with which hydrogen halide addition to alkenes? — HBr
27. The anti-Markovnikov addition of HBr to an alkene is favored by: — Presence of peroxides
28. Which of the following is a property of polythene? — Chemical inertness
29. Which of the following is a characteristic of anti-Markovnikov addition? — Halogen adds to the carbon with fewer hydrogens.
30. The peroxide effect is a result of: — Generation of free radicals
31. The peroxide effect in the addition of HBr to alkenes is an example of which type of addition? — Radical addition
32. Which type of bonding is formed between monomer units during addition polymerization? — Covalent bonds
33. The addition of a symmetrical reagent like Br2 to an alkene follows which rule? — Markovnikov's rule
34. The peroxide effect is an exception to which rule? — Markovnikov's rule
35. The addition of HI to an unsymmetrical alkene in the presence of peroxides follows: — Anti-Markovnikov's rule
36. Which catalyst is typically used in the Ziegler-Natta polymerization of alkenes? — Organometallic compounds
37. Polymerization of styrene (vinylbenzene) results in: — Polystyrene
38. The polymerization of tetrafluoroethene (CF2=CF2) yields: — Polytetrafluoroethene (Teflon)
39. Which of the following is NOT an example of addition polymerization? — Formation of nylon-6,6
40. Polymerization of vinyl chloride (chloroethene) yields: — Polyvinyl chloride (PVC)
41. The stability order of carbocations is: — Tertiary > Secondary > Primary
42. The carbocation formed during the electrophilic addition of HBr to propene is: — Secondary carbocation
43. The formation of a carbocation in electrophilic addition leads to: — Racemization
44. Which of the following is a consequence of the peroxide effect? — Reversal of regioselectivity compared to Markovnikov's rule.
45. Which bond is broken in the pi bond of an alkene during electrophilic addition? — Pi bond
46. In free radical addition of HBr to an unsymmetrical alkene, the regioselectivity is determined by: — Stability of the intermediate radical
47. Which of the following is a common initiator for free radical addition reactions of alkenes? — Organic peroxides
48. The chain transfer step in free radical polymerization involves: — Transfer of a radical from a growing chain to another molecule.
49. In the electrophilic addition of HBr to an unsymmetrical alkene, the rate-determining step is: — The attack of the electrophile (H+) on the alkene
50. What is the role of peroxides in the addition of HBr to alkenes? — They initiate a free radical chain mechanism.
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