Alkane Practice Problems:
In the preparation of Grignard reagent from haloalkane, the metal
(a) Mg
(b) Zn
(c) Li
(d) K
The most volatile compound is
(a) 2, 2-dimethyl propane
(b) 2-methyl butane
(c) Isobutane
(d) n-pentane
Which of the following is a good conductor of heat of electricity
(a) Diamond
(b) Graphite
(c) Anthracite
(d) Charcoal
What is freon-12
(a) Pesticide
(b) Refrigerant
(c) Solvent
(d) Lubricant
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Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe?
(a) Glycerol
(b) Glycol
(c) 1, 2-dibromoethane
(d) Benzene
Which of the following shows only one brominated compound?
(a) Butene-2
(b) 2, 2-dimethylpropane
(c) Butyne-1
(d) Butanol-3
Which of the following statements is not true for ethane?
(a) It can be chlorinated with chlorine
(b) It can be catalytically hydrogenated
(c) When oxidised produces CO2 and H2O
(d) It is a homologue of iso-butane
In the commercial gasolines, the type of hydrocarbons which are more desirable is
(a) Branched hydrocarbon
(b) Straight-chain hydrocarbon
(c) Linear unsaturated hydrocarbon
(d) Toluene
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Propionic acid is subjected to reduction with hydroiodic acid in the presence of a little P, the product formed is
(a) Ethane
(b) Propane
(c) Butane
(d) None of these
Kerosene is a mixture of
(a) Alkanes
(b) Aromatic compounds
(c) Alcohols
(d) Aliphatic acids
Natural gas contains mainly
(a) Methane
(b) n-butane
(c) n-octane
(d) Mixture of octane
Which of the following compounds is insoluble even in hot concentrated H2SO4?
(a) Ethylene
(b) Benzene
(c) Hexane
(d) Aniline
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Which of the following are produced from coaltar?
(a) Synthetic dyes
(b) Drugs
(c) Perfumes
(d) All the three
The addition of tetraethyl lead to petrol
(a) Lowers its octane number
(b) Raises its octane number
(c) May raise or lower the octane number
(d) Has no effect on octane number
A mixture of ethyl iodide and n-propyl iodide is subjected to Wurtz reaction. The hydrocarbon that will not be formed is
(a) n-butane
(b) n-propane
(c) n-pentane
(d) n-hexane
The preparation of ethane by electrolysis of aqueous solution of potassium acetate is called as
(a) Wurtz reaction
(b) Sabatier-Senderen’s reaction
(c) Kolbe’s synthesis
(d) Grignard reaction
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Knocking sound occurs in engine when fuel
(a) Ignites slowly
(b) Ignites rapidly
(c) Contains water
(d) Is mixed with machine oil
A sample of gasoline contains 81% iso-octane and 19% n-heptane. Its octane number will be
(a) 19
(b) 81
(c) 100
(d) 62
In the fractional distillation of crude petroleum
(a) Petrol condenses at the bottom of the column
(b) The gases condense at the top of the column
(c) High boiling constituents condense at the bottom of the column
(d) High boiling constituents condense at the top of the column
In the process of cracking
(a) Organic compounds decompose into their constituent elements
(b) Hydrocarbons decompose into carbon and hydrogen
(c) High molecular weight organic compounds decompose to give low molecular weight organic compounds
(d) Hydrocarbons yield alkyl radicals and hydrogen
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A mixture of propene and methane is obtained by the cracking of
(a) 1-butene
(b) 2-butene
(c) n-butane
(d) Isobutane
Isomerism in saturated hydrocarbons is due to
(a) Change in the valence of carbon
(b) Change in the ratio of elements in compounds
(c) Formation of branches in the chain of C atoms
(d) Formation of double bond
Formation of alkane by the action of Zn on alkyl halide is called
(a) Frankland’s reaction
(b) Wurtz reaction
(c) Cannizzaro reaction
(d) Kolbe’s reaction
Fischer Tropsch process is used for the manufacture of
(a) Synthetic petrol
(b) Thermosetting plastics
(c) Ethanol
(d) Benzene
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The order of appearance of the following with rising temperature during the refining of crude oil is
(a) Kerosene oil, gasoline, diesel
(b) Diesel, gasoline, kerosene oil
(c) Gasoline, diesel, kerosene oil
(d) Gasoline, kerosene oil, diesel
Which one of the following contain isopropyl group?
(a) 2,2,3,3-tetramethylpentane
(b) 2-methylpentane
(c) 2,2,3-trimethylpentane
(d) 3,3-dimethylpentane
How many types of carbon atoms are present in 2, 2, 3-trimethylpentane?
(a) One
(b) Two
(c) Three
(d) Four
Product obtained by nitration of propane is
(a) Nitropropane
(b) Nitromethane
(c) Nitroethane
(d) All of these
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In the dichlorination reaction of propane, mixture of products are obtained. How many isomers, the mixture contains
(a) 2
(b) 3
(c) 4
(d) 5
Grignard reagent is not prepared in aqueous medium but prepared; in ether medium because the reagent
(a) Reacts with water
(b) Is insoluble in water
(c) Is highly reactive in ether
(d) Becomes inactive in water
Out of the following fractions of petroleum, the one having the lowest boiling point is or Which of the following is obtained at lowest temperature by fractional distillation of petroleum
(a) Kerosene
(b) Diesel oil
(c) Gasoline
(d) Heavy oil
Alcoholic solution of KOH is used for
(a) Dehydration
(b) Dehydrogenation
(c) Dehydrohalogenation
(d) Dehalogenation
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Maximum carbon-carbon bond distance is found in
(a) Ethyne
(b) Ethene
(c) Ethane
(d) Benzene
Which of the following has highest knocking?
(a) Olefins
(b) Branched chain olefins
(c) Straight chain olefins
(d) Aromatic hydrocarbons
A petroleum fraction having boiling range 70-200°C and containing 6-10 carbon atoms per molecule is called
(a) Natural gas
(b) Gas oil
(c) Gasoline
(d) Kerosene
Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is
(a) n-hexane
(b) 2, 3-dimethylbutane
(c) 2, 2-dimethylbutane
(d) 2-methylpentane
