6. Haloalkanes and Haloarenes

*नोट: यह सेक्शन रिवीजन के लिए है। अपना ज्ञान परखने के लिए ऊपर दिए गए क्विज़ में भाग लें।

1. Which halogen is most reactive in the halogenation of alkanes in the presence of sunlight?
   A) Fluorine  |  B) Chlorine  |  C) Bromine  |  D) Iodine
2. What is Lucas Reagent?
   A) Conc. HCl + anhydrous ZnCl2  |  B) Conc. HNO3 + ZnCl2  |  C) Dil. HCl + ZnCl2  |  D) Conc. H2SO4 + MgCl2
3. Which halogen atom is present in the thyroxine hormone?
   A) Cl  |  B) I  |  C) Br  |  D) F
4. Which of the following is used as an anesthetic?
   A) Chloroform  |  B) Bromoform  |  C) Iodoform  |  D) Methyl chloride
5. What is the commercial name of CF2Cl2?
   A) Freon-11  |  B) Freon-12  |  C) Freon-112  |  D) Freon-122
6. In how many steps is the SN2 reaction completed?
   A) 1  |  B) 2  |  C) 3  |  D) 4
7. A carbon atom attached to four different groups is called?
   A) Chiral carbon  |  B) Asymmetric carbon  |  C) Symmetric carbon  |  D) Both A and B
8. The formula of phosgene, a poisonous gas formed by the oxidation of chloroform, is?
   A) COCl2  |  B) POCl2  |  C) PH3  |  D) CCl4
9. The product obtained in Wurtz reaction is?
   A) Ether  |  B) Alcohol  |  C) Ketone  |  D) Alkane
10. What type of reaction do haloalkanes undergo in the presence of ethanolic KOH?
    A) Substitution  |  B) Elimination  |  C) Polymerization  |  D) Dimerization
11. What is the chemical formula of Freon-11?
    A) CFCl3  |  B) CF2Cl2  |  C) CCl4  |  D) CHCl3
12. Heating an alkyl halide with dry Ag2O yields?
    A) Ester  |  B) Ether  |  C) Ketone  |  D) Alcohol
13. Which property is different in enantiomers?
    A) Melting point  |  B) Boiling point  |  C) Optical rotation  |  D) Refractive index
14. What is the value of optical rotation for a racemic mixture?
    A) 0  |  B) 1  |  C) 100  |  D) 90
15. What is the IUPAC name of CH3-CH(Cl)-CH3?
    A) 2-Chloropropane  |  B) 1-Chloropropane  |  C) Isopropyl chloride  |  D) Chloroethane
16. The reagent used in Sandmeyer's reaction is?
    A) Cu2Cl2/HCl  |  B) Na/Ether  |  C) AgF  |  D) Zn/HCl
17. What is the full form of DDT?
    A) Dichlorodiphenyltrichloroethane  |  B) Diphenyldichloroethane  |  C) Dichlorodiphenylethane  |  D) None
18. Tincture of iodine is?
    A) Aqueous solution of I2  |  B) Alcoholic solution of I2  |  C) Solution of KI  |  D) None
19. Which of the following will have the highest bond enthalpy?
    A) CH3-F  |  B) CH3-Cl  |  C) CH3-Br  |  D) CH3-I
20. In aryl halides, the halogen is attached to which hybridized carbon?
    A) sp  |  B) sp2  |  C) sp3  |  D) dsp2
21. Complete the reaction: CH3-CH2-OH + SOCl2 → ? + SO2 + HCl
    A) CH3-CH2-Cl  |  B) CH3-CH2-O-CH2-CH3  |  C) CH3-CHO  |  D) CH2=CH2
22. What is 'A' in the equation? CH3-CH2-Br + KCN (alcoholic) → A + KBr
    A) CH3-CH2-NC  |  B) CH3-CH2-CN  |  C) CH3-CH3  |  D) CH2=CH2
23. Complete the reaction: C6H5NH2 + NaNO2 + HCl (0-5°C) → ? + NaCl + H2O
    A) C6H5Cl  |  B) C6H5OH  |  C) C6H5N2+Cl-  |  D) C6H6
24. Reaction: 2CH3-Cl + Na (dry ether) → ? + 2NaCl
    A) CH4  |  B) C2H6  |  C) C3H8  |  D) CH3-O-CH3
25. Toluene reacts with chlorine in the presence of light to give?
    A) Chlorobenzene  |  B) Benzyl chloride  |  C) o-Chlorotoluene  |  D) p-Chlorotoluene
26. Which compound has the maximum C-X bond length?
    A) CH3-Cl  |  B) CH3-F  |  C) CH3-Br  |  D) CH3-I
27. Aryl halides are less reactive towards nucleophilic substitution because of?
    A) Resonance  |  B) sp2 hybridization of C  |  C) Higher bond energy  |  D) All of the above
28. Reaction of propene with HBr in the presence of peroxide gives?
    A) n-Propyl bromide  |  B) Isopropyl bromide  |  C) 2-Bromopropane  |  D) 1,2-Dibromopropane
29. In an allyl halide, the carbon attached to the halogen is hybridized as?
    A) sp3  |  B) sp2  |  C) sp  |  D) sp3d
30. What will be obtained by the reaction of methyl chloride with AgCN?
    A) CH3CN  |  B) CH3NC  |  C) C2H6  |  D) CH3Cl
31. What is obtained by the reaction of R-X with KNO2?
    A) Alkyl nitrite  |  B) Nitro alkane  |  C) Alkyl cyanide  |  D) Alkyl isocyanide
32. What is the hybridization of the intermediate carbocation formed in an SN1 reaction?
    A) sp  |  B) sp2  |  C) sp3  |  D) dsp2
33. Which is the best method to prepare R-F (Alkyl fluoride)?
    A) Finkelstein  |  B) Swarts reaction  |  C) Darzens  |  D) Wurtz
34. What happens in the Finkelstein reaction?
    A) Halogen exchange  |  B) Halogenation  |  C) Alkylation  |  D) Elimination
35. Which of the following will have the highest boiling point?
    A) CH3-F  |  B) CH3-Cl  |  C) CH3-Br  |  D) CH3-I
36. A hydrocarbon C5H10 gives C5H9Cl in sunlight. It is?
    A) Pentene  |  B) Cyclopentane  |  C) Isopentane  |  D) Butene
37. The reaction of an alkyl halide in the presence of anhydrous AlCl3 is called?
    A) Friedel-Crafts  |  B) Finkelstein  |  C) Swarts  |  D) Kolbe
38. Which statement is true for an SN2 reaction?
    A) Occurs in two steps  |  B) Carbocation is formed  |  C) Walden inversion takes place  |  D) Order is 1
39. The main cause of chirality is?
    A) Lack of symmetry  |  B) Identical groups  |  C) sp2 hybridization  |  D) None
40. The reaction of an alkyl halide with Na in dry ether is called?
    A) Wurtz  |  B) Fittig  |  C) Wurtz-Fittig  |  D) Swarts
41. Identify 'B' in the following reaction: CH3-CH2-Cl + AgCN → B + AgCl
    A) CH3-CH2-CN  |  B) CH3-CH2-NC  |  C) CH3-CH3  |  D) C2H5NH2
42. Complete the reaction: CH3-CH=CH2 + HBr (in presence of peroxide) → ?
    A) CH3-CH(Br)-CH3  |  B) CH3-CH2-CH2-Br  |  C) CH3-CH(Br)-CH2Br  |  D) CH2=CH-CH2Br
43. What will be the main product 'P' in the equation? C6H5Cl + CH3Cl + 2Na (ether) → P + 2NaCl
    A) Diphenyl  |  B) Benzene  |  C) Toluene (C6H5CH3)  |  D) Chlorotoluene
44. Reaction: CH3-CH2-Cl + KOH (alcoholic) → ? + KCl + H2O
    A) CH3-CH2-OH  |  B) CH2=CH2  |  C) CH3-CH3  |  D) CH3-CHO
45. How many total isomers are possible from the free radical chlorination of C5H12?
    A) 3  |  B) 5  |  C) 7  |  D) 8
46. Which is the most reactive towards nucleophilic substitution?
    A) Chlorobenzene  |  B) 4-Nitrochlorobenzene  |  C) 2,4-Dinitrochlorobenzene  |  D) 2,4,6-Trinitrochlorobenzene
47. In which of the following will the SN2 reaction be fastest?
    A) CH3Cl  |  B) CH3CH2Cl  |  C) (CH3)2CHCl  |  D) (CH3)3CCl
48. The hydrolysis of 3° butyl bromide proceeds by which mechanism?
    A) SN1  |  B) SN2  |  C) Elimination  |  D) Addition
49. The product obtained by reacting bromobenzene with Mg/ether is?
    A) Diphenyl  |  B) Phenol  |  C) Phenyl magnesium bromide  |  D) Benzene
50. Heating bromobenzene with Na/ether yields?
    A) 1,4-Dibromobenzene  |  B) Phenol  |  C) Diphenyl  |  D) Benzene
51. Which of the following will be optically active?
    A) CH3CH2OH  |  B) CH3CH(Br)OH  |  C) CH2BrCH2OH  |  D) CH3OH
52. Which is the most stable carbocation?
    A) Methyl  |  B) 1°  |  C) 2°  |  D) 3°
53. Reaction of which of the following with aqueous KOH will result in Walden inversion?
    A) n-Butyl chloride  |  B) 3° Butyl chloride  |  C) 3° Pentyl bromide  |  D) All of the above
54. The ease of displacement of H in free radical halogenation of alkanes is in the order?
    A) 1° > 2° > 3°  |  B) 3° > 2° > 1°  |  C) 2° > 3° > 1°  |  D) 1° > 3° > 2°
55. The reaction to obtain butane from ethyl bromide is called?
    A) Wurtz  |  B) Fittig  |  C) Wurtz-Fittig  |  D) Swarts
56. Which of the following will have the lowest boiling point?
    A) 1° butyl chloride  |  B) 2° butyl chloride  |  C) 3° butyl chloride  |  D) isobutyl chloride
57. Among R-Cl, R-Br, and R-I, which will undergo the fastest SN2 reaction?
    A) R-Cl  |  B) R-Br  |  C) R-I  |  D) Same for all
58. What is the common name of C6H5CH2Cl?
    A) Benzyl chloride  |  B) Benzo chloride  |  C) Chlorotoluene  |  D) Phenyl chloride
59. What is formed in the first step of an SN1 reaction?
    A) Free radical  |  B) Carbocation  |  C) Transition state  |  D) Carbanion
60. Where does electrophilic substitution take place in haloarenes?
    A) Only ortho  |  B) Only para  |  C) Ortho and para  |  D) Meta