CHAPTER 10
ALKYL HALIDES
1. Electrophile amongst the following is:
(a) NH3 (b) H2O (c) BF3 (d) Cl2
2. SN2 mechanism involves:
(a) 1st order kinetics (b) 2nd order kinetics (c) 3rd order kinetics (d) Zero order kinetics
3. Alkyl magnesium halide (Grignard's reagent) when hydrolyzed yields:
(a) Alkane
(b) Alkene
(c) Alkyne
(d) Alkyl halide
4. Tertiary alcohols are obtained by treating Grignard's reagent with:
(a) Aldehyde (b) Ketone (c) Water (d) Amine
5. Alkyl Halides are:
(a) Monohaloalkanes (b) Dihaloalkanes
(c) Polyhaloalkanes (d) All
6. Which substance is used to convert Grignard's reagent to alkane:
(a) H2O
(b) NH3
(c) Ethyl alcohol
(d) All of these
7. For the reaction C2H5OH+ HX —> C2H5-X + H2O the order of reactivity of HX is:
(a) HBr > HI > HCI (b) HI > HCI > HBr
(c) HCI > HBr > HI (d) HI > HBr > HCI
8. Carbanions are:
(a) Electrophiles (b) Nucleophiles
(c) Group of atoms (d) Free radical
9. Secondary alkyl halides follow
(a) First order kinetics
(b) Second order kinetics
(c) Both a and b
(d) none of these
10. (CH3)3CBr preferably undergoes:
(a) SN2 reactions (b) SNi reactions
(c) both a and b (d) none of these
11. Ethyl chloride reacts with alcoholic KOH to give:
(a) C2H4 (b) C2HSOH
(c) C2H6 (d) None of these
12. When an alcohol reacts with SOCl2 an alkyl halide is formed what are two other products:
(a) SO2 and HCI (b) SO2 and H2O
(c) HCI and H2O (d) H25 and HCI
13. Which of the following is not a nulceophile:
(a) OH- (b) NH3 (c) C2HSO- (d) Br+
14. Which of the following reactions is not shown by an alkyl halide:
(a) SNi (b) SN2 (c) Addition (d) Elimination
15. In primary alkyl halides, the halogen atom is attached to a carbon which is further attached to:
(a) One Carbon atoms (b) Two Carbon atoms (c) Three Carbon atoms (d) Four Carbon atoms
16. Reaction of following with Grignard's reagent can give primary alcohol:
(a) Epoxide (b) Peroxide
(c) Super oxide (d) Hydrogen
17. Snl reactions are easily given by: (a) Primary alkyl halide
(b) Secondary alkyl halide (c) Secondary alcohols
(d) Tertiary alkyl halides
18. Thionyl chloride reacts with alcohol to form: (a) Mustard gas (b) Alkyl halide
(c) Aldehyde (d) Alcohol
19. Which of the following is a Sodium Lead alloy: (a) Nan (b) Nasz (c) Na3Pb (d) Na4Pb
20. Secondary alcohol is formed when Grignard’s reagent reacts with: (a) Propanone (b) Methanal (c) Ethanal (d) Ethanoic acid
21. When Grignard reagent reacts with Epoxide, it forms:
(a) 1- Alkanal (b) 1- Alkanol
(c) Carboxylic acid (d) None
22. Which of the following reagent cannot be used for preparing alkyl chloride from alcohol: (a) HC|+ anhydrous ZnCIz (b) NaCI
(c) PCI5 (d) SOC|2
23. Carbon atom holding halogen in Alkyl halide is: (a) sp2- hybridized (b) sp3-hybridized (c) sp-hybridized (d) sp3d- hybridized
24. Which of the following does not give Iodoform test: (a) Ethanol (b) Ethanal (c) Acetophenone (d) Benzophenone
25. C-X bond is strongest in: (a) CH3CI (b) CHsBr (c) CH3F (d) CH31
26. The alkyl halide is converted into an alcohol directly by: .3 (a) Addition (b) Substitution (c) Dehydrohalogenation (d) Elimination g
27. Iodoethane reacts with sodium in ether, the product formed is: g (a) Ethane (b) Ethene (c) Butene (d) Butane
28. 1, 3 — Dibromopropane reacts with metallic zinc to form: '5 (a) Propene (b) Propane
(c) Cyclopropane (d) Hexane E
29. Ethyl alcohol gives Ethyl chloride with the help of: (a) SOCIz (b) NaCI (c) Clz (d) KCI E
30. Butane nitrile is formed by reaction of KCN with: (a) Propyl alcohol (b) Butyl chloride
(c) Butyl alcohol (d) Propyl Chloride 3
31. Tetrabomoethane on treatment with alcoholic zinc gives: 3 (a) Ethyl bromide (b) Ethane
(c) Ethane (d) Ethyne
32. Snl reaction of Alkyl halides leads to: (a) Retention of configuration
(b) Inversion of configuration (c) Both a and b
(d) None of these
33. Which one of the following will have the maximum dipole moment: (a) CH3F (b) CH3C| (c) CHsBr (d) CH3I
34. The reaction of an Alkyl halide with RCOOAg produces: (a) Ester (b) Ether (c) Aldehyde (d) Carboxylic acid
35. The order of a typical Sn2 reaction is: (a) Primary alkyl halide (b) Secondary alkyl halide (c) Secondary alcohols (d) Tertiary alkyl halides
36. Most reactive Alkyl halide towards Sul reaction is: (a) n-Butyl chloride (b) Sec-Butyl chloride (c) ter-Butyl chloride (d) A||y| chloride
37. Which responds +vely towards Iodoform test: (a) 1-Butene (b) Butanal (c) Acetic acid (d) 2-Pentanone
38. Electrophile among the following is: (a) NH3 (b) H20 (c) BF3 (d) C|2
39. The order of a typical SN2 reaction is: (a) Zero (b) First (c) Second (cl) Third
40. Which of the following is not a Nulceophile? (a) H20 (b) H28 (c) BF3 (d) NH3
41. In which two mechanisms, the first step involved is same: (a) El and E2 (b) E2 and SN2 (c) E1 and SNl (cl) SNl and SN2
42. SN2 reactions are: (a) Unimolecular (b) Bimolecular (c) Trimolecular (cl) Tetramolecular
43. Elimination bimolecular reaction involves kinetics: (a) 1St order (b) 2nd order (c) 3rd order (cl) Zero order
44. In primary alkyl halides, the halogen atom attached to a carbon atom is further attached to how many carbon atoms: (a) Two (b) Three (c) One (cl) Four
45. Elimination bimolecular reaction involves: (a) First order kinetics (b) Second order kinetics ‘3 (c) Third order kinetics (d) Zero order kinetics E
46. Ethyl magnesium bromide reacts with water to form: 8 (a) Ethane (b) Methane >', (c) Propane (d) n-butane .
47. Primary alcohol is obtained by treating Grignard’s Regent with: E (a) HCHO (b) CH3CH0 (c) CH3C0CH3 (d) CO2 g
48. In SN2 mechanism, the hybridization of carbon atom changes from: (a) Sp (b) Sp2 3 (c) dsp2 (cl) none of these :
49. Tertiary alcohol is obtained by treating Grignard reagent with: (a) HCHO (b) CH3CH0 (c) CH3C0CH3 (D) C02 2
50. Order and molecularity of SN2 reaction of alkyl halide is: (a) 1,2 (b) 2,1 (c) 2,2 (d) 0,1