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Chemistry F.Sc. First Year (Inter part 1) MCQs Chapter Number Eight (8)

Chemistry F.Sc.

First Year (Inter part 1)
MCQs Chapter Number Eight (8)


ALIPHATIC HYDROCARBONS 8




Multiple Choice questions. Encircle the correct answer.
Exercise Q No. 3 (1----10)
1. Preparation of vegetable ghee involves
(a) Halogenation (b) Hydrogenation
(c) Hydroxylation (d) Dehydrogenation
2. Formula of chloroform is
(a) CH3C1 (b) CC14
(c) CH2C12 (d) CHC13
3. The presence of a double bond in a compound is the sign of
(a) Saturation (b) Unsaturation
(c) Subsitution (d) none
4. Vinyl acetylene combines with HCI to form
(a) Polyacetylene (b) Benzene
(c) Chloroprene (d) Divinylacetylene
5. The addition of unsymmetrical reagent to an unsymmetrical alkene is
in accordance with the rule
(a) Hund’s rule (b) Markownikov’s rule
(c) Pauli’s Exclusion Principle (d) Aufbau Principle
6. Synthetic rubber is made by polymerization of
(a) Chloroform (b) Acetylene
(c) Divinylacetylene (d) Chloroprene
7.  -  - dichloroethyl sulphide is commonly known as
(a) Mustard gas (b) Laughing gas
(c) phosgene gas (d) Bio-gas
8. Hydroxylation of alkene can be carried out by
(a) Alkaline KmnO4 (b) Acidic KMnO4
(c) K2 Cr2 O7 (d) O3
9. When methane reacts with C12in the presence of diffused light the
products obtained are:
(a) Chloroform only (b) Carbon tetrachloride
(c) Chloromethane and dichloromethane
(d) Mixture of a, b, c
10. Which one of the following gases is used for artificial ripening of
fruits.
(a) Ethane (b) Ethyne
(c) Methane (d) Propane
11. I U P A name of the compound
CH3

H3C – (CH2)4 – CH – C – CH2 – CH3

CH3 (CH2)2 – CH3 is
6, 7 di methyl – 7 – n – Propyl nonane
4, 5 – Dimethyl – 4 – ethyl decane
3, 4 – Dimethyl – 3 – n – propyl noname
6, 7 Dimethyl – 7 ethyl decane.
12. I U P A C name of the compound CH2 = CH CH (CH3)2 is
(a) 2 vinyl propane (b) 1,1, dimethyl –2- propane
(c) 3 methyl – 1- butene (d) 1 – isopropyl ethylene
13. The compound 2, 2 dimethyl propane is also known as
(a) Neo pentane (b) Neo butane
(c) Neo propane (d) Propane dimethyl
14. An alkane C6H14 can be prepared by the hydrogenation of only two
alkenes (C6H12). I u P A C name of the alkane is
(a) 2,2 – Dimethyl butane (b) 2,3 – Dimethyl butane
(c) 2 – methyl pentane (d) n Hexane
15. C8H18 (A) on chlorination gives only one type of C8H17 CI. Hence A is
(a) Iso octane (b) 2,3 dimethyl hexane
(c) 2,2 3,3 Tetramethyl butane (d) 3,4 Dimethyl hexane
16. An alkene C7H14 was subjected to ozonolysis in presence of Zn dust.
An equimolecular amount of the following two compounds was
obtained.
H3C H3C
C = O and C = O
H3C H3C – H2C

The I u P A C name of the alkenen is

(a) 3,4 Dimethyl – 3 – Pentene (b) 3,4 Dimethyl – 2 – Pentene
(c) 2,3 Dimethyl – 3 – Pentene (d) 2,3 Dimethyl – 2 – Pentene
17. Ethene on ozonolysis, in presence of Zn dust produces
(a) Formaldehyde (b) Acetaldehyde
(c) Acetone (d) Butanone
18. The major product of dehydrohalogenation of 2 – chloro – 2 - methyl
butane is
(a) CH3

H3C – CH = C – CH3
(b) CH3 – CH2 – CH2 CH= CH2
(c) CH3 CH2 – CH = CH – CH3
None of these
19. 1- Chloro propane on dehydrohalogenation with alcoholic KOH guies
(a) Ethene (b) Propene
(c) 1 – butene (d) 2 methyl 1 – butene
20. The hybridized carbon atoms present in 1,2 – butadiene are
(a) Only sp (b) sp, sp2, sp3
(c) Only sp2 (d) sp and sp
21. When H – Br is added to 1,3 butadiene the addition products obtained are
(a) 1, 2 (b) 3, 4
(c) 1, 2 and 3, 4 (d) 2, 3
22. When H – Br is added to 2 methyl propene, the addition product
obtain is
1 – Bromo – 2 methyl propane
2 – Bromo – 2 methyl propane
2 – Bromo Propane
2 – methyl propane
23. An aqueous solution of K-Salt of a dibasic acid on electrolysis forms a
gas X at anode that decolourises Br2 water and gave n-butane on
hydrogenation with H2. The gas X and dibasic acid are respectively.
2 – Butene and HC3 – CH – COOH

H3C – CH – COOH
1 – Butene and (COOH)2
n – Butyne and (CH2 COOH)2
None of above
24. The compound which reacts with H – B obeying Mar Kownikoff rule
is
(a) H2C = CH2 (b) H3C – CH = CH – CH3
(c) H3C – C = CH2 (d) None

CH3
25. When sodium salt of dicarboxylic acid, sodium suceinate is subjected
to electrolysis in an aqueous solution, the product formed at anode is
(a) H2C = CH2 (b) H3C – CH3
(c) HC = CH (d) H3C – CH = CH2
26. Which of the following can add ozone molecule?
(a) C2H6 (b) C2H4
(c) C2H2C14 (d) C2H4C12
27. Arrange HCI, H Br, HI and HF in order of decreasing reactivity
towards alkene
HF > HC1 > H Br > HI
H Br > HF > HC1 > HI
HC1 > H Br > HF > HI
HI > H Br > HC1 > HF
28. Identify the set of reagents / reaction conditions x and y in the
following transformation.
CH3 – CH2 – CH2 – Br x Product y CH3 –CH – CH3
Br
X = Dil aq Na OH 20oC
Y = H Br / acetic acid 20o C
X = Conc Alcoholic NaOH, 80oC
Y = H Br / acetic acid 20oC
X = Dil Aq NaOH 20o C
Y = Br2 / CH C13 , 0oC
X = Conc alcoholic NaOH 80oC
Y = Br2 / CH C13 , 0oC
29. Unsaturated nature of alkene can be detected by
(a) Ozonolysis (b) Decolourisation
(c) Decolourisation of Pink Colour of Baeyer’s reagent
All of the above
30. Which of the following compound decolourises Baeyer’s reagent but
does not react with ammonnecial AgNO3?
(a) CH4 (b) C2H4
(c) C2H2 (d) C2H6
31. Hydrocarbon A on Chlorination gives B which on heating with
alcoholic KOH change into another hydrocarbon C. The ‘C’
decolourises Beayer’s reagent and on ozonolysis formaldehyde only.
‘A’ is
(a) Ethene (b) Ethane
(c) Butene (d) Butane
32. Propyne and propene can be distinguished by
(a) Conc, H2SO4 (b) Br2 in CC14
(c) Dil, KMnO4 (d) AgNO3 in ammonia
33. Identify the reagent which can easily distinguish between 1-butyne
and 2-butyne
(a) Br2, CC14 (b) H2, Catalyst
(c) Dil, H2SO4 HgSO4 (d) Ammonical Su2C12 solution
34. 1 – Hexyne reacts with a solution of n – Propyl magnesium bromide to
form product which does not decolourise Br2water. The product is
(a) alkyne (b) Alkene
(c) Alkane (d) Alkyl halide
35. 2 – Butene can be converted into 2 – butyne by the addition of Br2
followed by reaction with.
(a) Na NH2 (b) Alcoholic KoH
(c) Both a and b (d) Catalyst


36. C5H12 hydrocarbon has the following structural arrangement
H3C – CH2 – CH2 – CH2 – CH3
CH3 – CH – CH2 – CH3

CH3
(c) CH3 (d) All the above
H3C – C – CH3

CH3
37. Number of structure isomers of butane is
(a) 2 (b) 3
(c) 4 (d) 5
38. 2,2 Dimethyl propane can be named as
(a) n – butane (b) isobutene
(c) neobutane (d) none of above
39. Which ion is most stable?
(a) C H+3 (b) CH3 – C H+2
(c) (CH3)2 CH (d) (CH3)3 C
40. Hydrogenation of propene produces
(a) Propane (b) Ethane and methane
(c) Ethane (d) Ethyl chloride
41. 2 – Bromobutane react with Zn in presence of an aqueous acid to give
a gas ‘A’ which does not decolorize Br2 water and have no effect on
Baeyer’s reagent the gas A is
(a) n – Butane (b) Iso Butane
(c) Neo butane (d) None of the above
42. Formula of Tetra chloromethane is
(a) CH3 C1 (b) CH2 C12
(c) CH C13 (d) C C14
43. Sodium salt of Propionic acid on hydrolysis with soda lime produces
(a) Propane (b) Propene
(c) Ethane (d) Ethene
44. When Potassium salt of mono carboxylic acid, potassium acetate is
subjected to electrolysis in an aqueous solution, the product formed at
anode is.
(a) Methane (b) Ethane
(c) Ethene (d) Ethyne
45. An alkyl halide react with Mg to form alkyl Mg halide, which on
hydrolysis produces.
(a) Alkyne (b) Alkane
(c) Alkene (d) None
46. Carbonyl compounds, Aldehydes or Ketones is reduced to an alkanes
using Zn amalgam and H C1 in case of aldehydes and hydrazine in the
presence of KOH in case of Ketones. The reaction is called.
Kolbe’s reaction
Clemmenson or wolf kishner’s reduction
Friedel – Crafts reaction
Dow’s method
47. Hydrogenation accompanied by bond cleavage is called
(a) Hydrolysis (b) Hydrogenolysis
(c) Hydration (d) Hydrogenation
48. Hydrogenation of ethane at 200 –300oC produces
(a) Ethane (b) Ethyne
(c) Methane (d) Propane


49. Alkanes gives following reaction only due to their inertness
(a) Substitution (b) Addition
(c) Reduction (d) Oxidation
50. Methane, when burnt in the presence of metallic catalyst Cu at 400oC
and 200 atmospheric pressure produces.
(a) CH3OH (b) HCHO
(c) HCOOH (d) All a, b, c,
51. identify the products A and B in the given reaction
C2H5OH ConcH2SO4 A Br2B
180oC
A is ethene and B is and aldehyde
A is ethene and B is thyl bromide
A is ethyne and B is 1,1 – dibromo ethane
A is ethene and B is 1,2 – dibromo ethane
52. The presence of triple bond in a compound is the sign of
(a) Saturation (b) Unsaturation
(c) Addition (d) Substitution
53. Which one of the following gases is obtained by heating a mixture of
sodium proprionate and sodium hydroxide.
(a) C2H4 (b) C2H2
(c) C2H6 (d) C2H2
54. Methane reacts with steam at 900oC in the presence of Ni catalyst to
form.
(a) CH C13 (b) CO + H2
(c) C2H6 (d) CH3 OH
55. Methane barns in presence of oxygen to produce
(a) CO + H2O (b) CO2 +H2O
(c) CO + H2 (d) CO2 + H2
56. Incomplete oxidation of methane in presence of limited supply of
oxygen result in the formation of
(a) CO2 + H2O + C (b) CO + H2O + C
(c) CO2 + H2 + CO (d) CO + H2 + C
57. Methane reacts with HNO3 at 450oC in vapour phase and undergo
substitution reaction to produce.
(a) Nitro methane (b) Di nitro methane
(c) Tri nitro methane (d) Tetra nitro methane
58. 1 – bromo propane on heating with alcoholic KOH undergo
dehydrohalogenation reaction to produce.
(a) Propene (b) Propene + K Br
(c) Propene + K Br + H2O (d) None of above
59. Identify the conditions and the reagent X, Y in the following reaction.
R – CH2 – CH2 –OH x Product y H3C – CH – CH3
340-450oC
Br
X = A12O3 heated
Y = H – Br
X = A12O3 Cold
Y = Br2
X = A12O3 heated
Y = Br2
(d) X = A12O3 Cold
Y = H – Br





60. Which one of the following alkyl halide will not undergo
dehydrohalogenation with alcoholic KOH
CH3 – CH2 – CH2 – C1
CH3 – CH – CH3
C1
H3C – CH2 - CH2 – CH2 – C1
CH3

H3C – C – CH3

C1
61. The ease of dehydration of various alcohols is in the order
Prim alcohol > Sec. Alcohol > tert. Alcohol
Tert. Alcohol > Sec. Alcohol > Prim. Plcohol
Secondary alcohol > Prim. Alcohol > Tert. Alcohol
Prim. Alcohol > Tert. Alcohol > Secondary alcohol
62. The order of reactivity of halogens with alkanes is
F2 > C12 > Br2 > I2
I2 > Br2 > C12 > F2
Br2 > F2 > C12 > I2
I2 > F2 > C12 > Br2
63. When 2,3 dibromo butane is treated with Zn dust in an anhydrous
solvent like methanol, dehalogenation occurs and the product formed
is
(a) 1 – butene (b) 2 – butene
(c) 3 – bromo 1 – butene (d) 3 – bromo – 2 – butene
64. On electrolysis of Disodium succinate in aqueous solution, product
formed at cathode is
(a) H2 (b) NaOH
(c) NaOH + H2 (d) C2H4
65. The decreasing reactivity order of alkanes, alkenes and alkynes are as
follows
Alkanes > alkenes > alkynes
Alkynes > alkenes > alkanes
Alkenes > Alkynes > Alkanes
Alkynes > alkanes >Allkenes
66. Formula of Lindler’s catalyst is
(a) Pd (BaSO4) / Quinoline (b) Pb (BaSO4) / Quinoline
(c) Ba (Pd SO4) / Quinoline (d) P (BaSO4) / Quinoline
67. Hydrogenation of 2 – ethyne in presence of lindler’s catalyst produces
(a) Cis-butane (b) Trans – butane
(c) Both a, and b (d) None
68. Which one of the following is a major reaction occouring in the
internal combustion of engines of automobiles.
(a) oxidation (b) Combustion
(c) reduction (d) Halogenation
69. Double bond of alkenes consists of
(a) Two Pi bonds (b) Two sigma bonds
(c) one sigma bond and on Pi bond
Two covalent and coordinate covalent bond
70. Raney nickel is prepared by treating
Ni – Al alloy with caustic soda
Ni – Al alloy with caustic potash
Co – Al alloy with caustic soda
Mn – Al alloy with caustic soda

71. Ni-Al alloy when treated with aqueous solution of caustic soda
(a) A1 + Na A1O2 + H2 (b) Ni + Na A1O2 + 3/2 H2
(c) Ni + Na A1O2 (d) Ni +3/2 H2
72. 3 – Methyl – 1 – batene on hydrogenration over Raney Nickle at about
100oC and up to 3 – atmospheric pressure produces.
(a) N – Pentane (b) Iso – Pentane
(b) Neo Pentane (d) All a, b, c
73. The Markownikov’s Rule governed the reaction
(a) SN1 reaction (b) SN2
Hydrogenation of alkene
Addition of HX to unsymmetrical alkene
74. Addition of H – Br to 1 – Propene produces
(a) 1 – bromo propane (b) 2 – bromo propane
(c) Both a, and b (d) None
75. Addition of H – Br to 2 methyl propene4 produces
1 – bromo, 2, methyl propane
2 – bromo, 2 methyl propane
1 – bromo butane
2 – bromo butane
76. H2C = CH2 + H – HSO4 A + H2O 100oCB + H 2SO4 In the above
reaction identify A and B
A is CH3 – CH2 – HSO4 , B is CH3 CH2OH
A is CH3 – HSO4, is CH3 CH2 OH
A is CH3 CH2 – HSO4, B is CH3OH
A is CH3 – HSO4 , B is CH3OH
77. Ethene on bromination in an inert solvent like carbon tetrachloride
produces
(a) Trans – 1, 2, Dibrmo ethane (b) Cis – 1, 2, Dibromo ethane
(c) 1, 1, Dibrom ethane (d) All the above
78. Chlorohydrin CH2 – CH2 is produced by the reaction of Ethene with
Cl OH
(a) HC1 (b) HC1 + H2O
(c) C12 + H2O (d) C12
79. Baeyer’s reagent is
Dilute ( 1 % ) alkaline KMnO4
Conc alkaline KMnO4
Aqueous Br2
A mixture of Fe Br3 and Br2
80. A gas decalourizes dilute alkaline KMnO4 but has no action with
Ammonia AgNO3, this gas is
(a) CH4 (b) C2H6
(c) C2H4 (d) C2H2
81. Ethene burns is air to produce
(a) CO + H2O + heat (b) CO2 + H2O + heat
(c) CO2 + H2 + heat (d) C + H2O + heat
82. Ethene at 400oC and 10 atmospheric pressure, polymerize to produce
(a) PVC (b) polyethylene
(c) Mustard gas (d) Epoxide
83. Ethene gas is used in depening the colour of
(a) Sweets (b) Clothes
(c) Citrus fruits (d) Flowers





84. Identify the product ‘X’ in the following reaction
CH3 – CH2 = CH2 + H – Br X
(a) CH3 – CH2 – CH2 – Br (b) CH3 – CH – CH3

Br
(c) CH2 = CH – CH2 – Br (d) CH2 = CH – CH2
85. The polythene is a polymer of
(a) Ethene (b) Acetylene
(c) Acetone (d) Propylene
86. A liquid hydrocarbon is converted into a mixture of gaseous
hydrocarbon by
(a) Oxidation (b) Reduction
(c) Hydrolysis (d) Cracking
87. General Formula of alkynes is
(a) Cn H2n 2 (b) Cn H2n
(c) Cn H2n-2 (d) Cn H2n 1
88. A metallic carbide on treatment with water gives out a colourless gas,
which barns readily in air and give red precitritate with Cu Cl2 +
NH4OH. The gas is
(a) CH4 (b) C2H2
(c) C2H4 (d) C2H6
89. Acetylene polymerized in the presence of ammonium chloride and
cuprous chloride to form
(a) PVC (b) polythene
(c) Divinyl acetylene (d) Benzene
90. 1, 2 dibromo propane on treatment with alcoholic KOH produces
(a) Acetylene (b) Vinyl bromide
(c) 1, 3 propane diene (d) propyne
91. Ethyne is produced when tetrabromo ethane reacts with
(a) Fe (b) K
(c) Cd (d) Zn
92. Electrolysis of sodium salt of ethane dioic acid produces acetylene at
anode. Reaction is called
Sabatier – Sendern’s reaction
Kolbe’s method
Berthelot process
Wartz synthesis
93. Ethyne reacts with H2 in the presence of Ni or Pt catalyst. Final
product of the reaction is
(a) Ethene (b) Ethane
(c) Ethene and Ethane (d) Methane
94. HC = CH + Cl2A H2C = CH2 + Cl2 A B what will be A and B
Cl Cl
A = C C14 , B = 1, 1, 2, 2 tetra chloro ethane
A = C C14, B = 1, 1 dichloro ethane
A = C C14, B = 1, 2 dichloro ethane
A = C C14, B = 1, 2 dichloro ethane
95. Ethyne reacts with H – Br to produce
(a) Vinyl bromide (b) 1, 1 dibromo ethane
(c) 1, 2 dibromo ethane (d) Ethyl bromide
96. H3C – C = CH + H2O X Y, identify X and Y
(a) X = HgSO4 Y = CH3CHO
(b) X = H2SO4 Y = CH3COCH3
(c) X = HgSO4 / H2SO4 Y = CH3COCH3
(d) X = HgSO4 / H2SO4 Y = CH3CHO
97. HC = CH + H2OHgSO4 / H2SO4 X ==== CH3 – CHO
identify the intermediate product, X.
(a) Vinyl alcohol (b) Ethyl alcohol
(c) Methyl alcohol (d) Propyl alcohol
98. n. Propyl alcohol Conc. X Br2 Y Br2 Z
H2SO4 KOH
Identify the final product Z
(a) Batene (b) Butyne
(c) propene (d) Propyl alcohol
99. Which one of the following is product when acetylene is passed
through a copper tube at 300oC
(a) Benzene (b) Toluene
(c) Xylene (d) Propyne
100. Neoprene, asynthetic rubber is produced by the polymerization of
chloroprene, which is produced by addition of HCI in presence of
CU2Cl2, NH4 Cl to
(a) Ethyl acetylene (b) Methyl acetylene
(c) Vinyl acetylene (d) Divinyl acetylene
101. In the following reaction
HC=CH+HC = CH x Y + HC = CH H2C=HC-C=C-CH-CH2
Identify X and Y
(a) X is Cu2C12 Y is H3C – C = C – H
(b) X is NH4C1 Y is H3X – C = C – CH – CH3
(c) X is Cu2 C12, NH4C1 Y is H2C = CH – C = C – CH3
(d) X is Cu2 C12, NH4C1 Y is H2C = CH – C = C – CH3
102. Acetylene burns in air to produce
(a) CO2 + H2O + heat (b) CO + H2O + heat
(c) CO2 + H2O + heat (d) CO2 + H2 + heat
103. In ethyne, the hydrogen atom is bonded to the carbon atom with
(a) SP – S overlap (b) SP2 – S overlap
(c) SP3 – S overlap (d) SP – SP overlap
104. Which statement is correct about acetylene
it form sodium acetylide with soda mide in liquid NH3­­ or with
molten sodium
If gives reddish brown ppt. of Di-copper acetylide with ammonical
Cu2 Cl2.
(c) It gives white ppt of Di-sodium acetylide with ammonical AgNO3
(d) All above are correct
105. Age = C Ag + H2SO4 (dill) Y + Ag2SO4
Identify the product Y in above reaction
(a) Ethane (b) Ethene
(c) Ethyne (d) Propyne
106. Ozonolysis is a technique used for determining
(a) Ability to form soaps (b) Number of – OH groups
(c) Number of – COOH group (d) Position of double bonds
107. When alcoholic solution of dihalide other than that of methane is
warmed with granulated zine, there is formation of
(a) Akyl halide (b) Alkenes
(c) Alkynes (d) Alkanes
108. Ethyle bromide reacts with silver nitrite to give
(a) Ethyl nitrite (b) Ethyle nitrite and nitro ethane
(c) nitro methane (d) nitro ethane
109. Which of the following is not linked with methane
(a) Coal gas (b) Marsh gas
(c) Natural gas (d) Producer gas

110. Saturated hydrocarbons exhibit
(a) Chain isomerism (b) Position isomerism
(c) Ring – Chain isomerism (d) Metamerism
111. Both methane and ethane may be obtained by suitable one step
reactions from
(a) Ethyl alcohol (b) Methyl alcohol
(c) Methyl iodide (d) Ethyl iodide
112. The paraffin C5 H12 with the structure CH3
H3C – C – CH3

Could not be Called CH3
(a) 2 – methyl isobutene (b) Tetra methyl methane
(c) neopentane (d) 2, 2 dimethyl propane
113. When chloroform is reduced with Zinc and water, there is formation
of
(a) Methyl chloride (b) Methylene chloride
(c) Trichloro methane (d) Methane
114. Natural rubber is polymer of
(a) Chloroprene (b) Isoprene
(c) Ethylene (d) Propene
115. In the series ethane, ethane, ethyne, the C – H bond energy is
greatest in ethane
greatest in ethene
greatest in ethyne
the same in all the three compounds

Correct Answer (Multiple Choice)
1 ______ b 2 ______ d 3 ______ a
4 ______ c 5 ______ b 6 ______ d
7 ______ a 8 ______ d 9 ______ d
10______d 11______b 12______d
13______a 14______b 15______c
16______d 17______a 18______a
19______b 20______b 21______c
22______b 23______a 24______c
25______a 26______b 27______d
28______b 29______d 30______b
31______b 32______d 33______d
34______c 35______c 36______c
37______a 38______c 39______d
40______a 41______a 42______d
43______c 44______c 45______b
46______b 47______b 48______a
49______a 50______d 51______d
52______b 53______c 54______b
55______b 56______b 57______a
58______c 59______a 60______d
61______b 62______a 63______b
64______c 65______c 66______a
67______a 68______b 69______c
70______a 71______b 72______b
73______d 74______b 75______b
76______a 77______a 78______c
79______a 80______c 81______b
82______b 83______c 84______b
85______a 86______d 87______b
88______b 89______c 90______d
91______d 92______b 93______b
94______a 95______b 96______c
97______a 98______d 99______a
100_____c 101_____c 102_____c
103_____a 104_____d 105_____c
106_____d 107_____b 108_____b
109_____d 110_____a 111_____d
112_____a 113_____d 114_____a
115_____d

Complete Chapter 8
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