Chemistry Chapter 14 Entry Test MCQs
Alkenes
51. Which of the following acids adds to propene in the presence of peroxide to give anti-Markownikoff’s product?
a. HBr
b. HF
c. HI
d. HCl
52. Isopropyl iodide is formed after reaction of propene with HI, this is due to
a. homolysis
b. more stable free radical
c. more stable carbocation
d. more stable carbanion
53. In hot alkaline KMnO4 2-butene gives
a. Glycerol
b. Glycol
c. Alcohol
d. Acetic acid
54. The reaction of alcoholic KOH on ethyl chloride gives
a. Ethanol
b. Ethane
c. Acetylene
d. Ethene
55. The temperature during the polymerization of ethene is maintain at
a. 400°C
b. 200°C
c. 100°C
d. 300°C
56. Unsaturated nature of alkene can be detected by:
a. Decolorization of pink colour of KMnO4 solution
b. Decolorization of red Br2 water in CCl4
c. Ozonolysis
d. All of these
57. Ethene is produced from ethyl chloride by the process:
a. Dehydration
b. Hydration
c. Dehydrohalogenation
d. Dehalogenation
58. Which of the following does not change when ethene is polymerized to polyethylene?
a. Density
b. Melting Point
c. % composition
d. Molar mass
59. An alkene is treated with cold alkaline KMnO4 in experiment-1 and with hot alkaline KMnO4 in experiment-2 separately. What will be pair of products in the two experiment?
a. Glycerol and aldehyde
b. Glycol and glycerol
c. Glycol and ketone
d. Glycol and carboxylic acid
60. A hydrocarbon which is gas at room temperature decolourizes aqueous solution of bromine. The formula of the compound is:
a. C7H16
b. C2H6
c. C10H20
d. C2H4
61. Which alkene on ozonolysis will give only acetaldehyde as a product?
a. 2-Butene
b. Propene
c. Isobutylene
d. 1-Butene
62. Ozonolysis of C7H14 gave 2-methyl-3-pentanone. The alkene is
a. 2-Ethyl-3-methyl-1-butene
b. 2-Methyl-2-ethyl-3-butene
c. 2,5-Dimethyl-3, 4-diethylhex-3-ene
d. 2-Methyl-3-ethyl-1-butene
63. 1,2-Dichloroethane treated with Acoholic ‘Zn’ Product will be.
a. Ethyl alcohol
b. Ethene
c. Ethyl Chloride
d. Ethyne
64. Ozonide is very unstable compounds, when treated with zinc it is
a. Reduced directly to carbonyl
b. Oxidized directly to carbonyl
c. Reduced indirectly to carbonyl
d. Oxidized indirectly to carbonyl
65. Alkenes are converted into alkyl halides by reacting with:
a. Dry gaseous of hydrogen halides
b. Aqueous solution of hydrogen halides
c. Aqueous solution of halogens
d. Acidic solution of hydrogen halides
66. Catalytic hydrogenation is used on commercial scale as analytical tool, generally it is
a. Quantitative
b. Qualitative
c. Just hypothetical
d. Both quantitative as well qualitative
67. Negative catalyst for hydrogenation process is:
a. Ni
b. Pt
c. Pd
d. Quinoline
68. An alkene of molecular formula C6H12 on ozonolysis gave CH3 CH2 CHO and CH3 CO CH3. the alkene is
a. (CH3)2C = CH CH2 CH3
b. CH3(CH2)2CH = CH CH3
c. (CH3)2C = C (CH3)2
d. C2H5 CH = CH C2H5
69. 1–bromopropane reacts with alcoholic KOH, then with Br2 water to produce a product which again reacts with Alcoholic KOH to produce?
a. Propyne
b. 1,2-dibromopropane
c. Propene
d. Propane
70. Addition of which reagent in unsymmetrical alkenes not obey Markownikoff rule:
a. HCN
b. HCl
c. Br2
d. HOCl
71. During de-hydration of alcohols to alkenes by heating with Con. H2SO4 . The first step is
a. Protonation of alcohol molecule
b. Formation of an ester
c. Elimination of water
d. Formation of carbocation
72. The reaction of HBr with (CH3)2C = CH2 in the presence of peroxide will give
a. (CH3)2CHCH2Br
b. (CH3)2CBrCH3
c. CH3CH2CH(CH3)2
d. CH3H2CH2CH2Br
73. Which one of the following compounds does not form an ozonide
a. Propene
b. Ethene
c. Propane
d. Propyne
74. Pick out the alkane which differs from the other members of the group.
a. 2-methyl butane
b. 2,2-dimethyl propane
c. 2,2-dimethyl butane
d. Pentane
75. A good quality polyethene can be prepared by using which catalyst:
a. TiCl4, Et3Al
b. Pd(BaSO4)
c. TiCl4, Et3B
d. PtCl4, AlEt3