aliphatic hydrocarbons
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Multiple Choice Questions on Aliphatic HydrocarbonsTRANSCRIPT
Aliphatic Hydrocarbons
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1Hydrogenation of alkenes/alkynes in the presence of Ni as catalyst at 300 degree Celcius results in the formation of corresponding alkanes. This reaction is known as( )Kolbe's reaction
( )Cannizaro's reaction
( )Haloform resction
( )Sabatier-senderens reaction
Single Answer
2Water gas is produced by treating methane with( )H2SO4
( )NaOH
( )H2O
( )HCl
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3Alhyl halides when reduced with nascent hydrogen in the presence of Zn+HCl are converted to( )Alkenes
( )Alcohol
( )Alkanes
( )Alkynes
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4When an aqueous solution of potassium salt of monocarboxylic acid is subjected to electrolysis, corresponding alkane is formed. This reaction is known as( )Sabatier-senderens reaction
( )Cannizaro reaction
( )Kolbe's reaction
( )Alkylation
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5Ethylene can be prepared in the laboratory by heating together ethyl alcohol and ( )Phenol
( )H2SO4
( )HCl
( )HF
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6Alkenes combine readily with electrophilic reagents such as halogens giving( )Vicinal dihalides
( )Haloalkanes
( )Vinyl halides
( )Gem-dihalides
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7Ethyl hydrogen sulphate on hydrolysis with boiling water is converted to( )Methyl alcohol
( )Propyl alcohol
( )Ethylene
( )Ethyl alcohol
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8Ethylene combines with water in the presence of H2SO4 + HgSO4 and forms( )Ethyl chloride
( )Ethyl alcohol
( )Carboxylic acid
( )None of these
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9When ethene is passed through a dilute solution of KMnO4 the pink colour changes to( )Colourless
( )Red
( )Green
( )Blue
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10Ethylene polymerizes at 100 atm pressure and 400 degree Celsius to give( )Polyalcohol
( )Polyethylene
( )Polybenzene
( )Polypropylene
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11Ethylene decolourizes dilute solution of KMnO4. This test is known as( )Silver mirror test
( )Colouration test
( )Ring test
( )Baeyer's test
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12Which gas is produced by treating CaC2 with water( )HCl
( )Methane
( )Ethane
( )Acetylene
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13Which gas is used for welding purposes( )Acetylene
( )Nitrogen
( )Methane
( )Butane
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14Acetylene is used in the manufacture of( )Rubber
( )Plastic
( )Ethyl alcohol
( )All these
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15When n-hexane is heated in the presence of Pt at 500 degree celsius, it cyclists to give( )Cyclohexene
( )Benzene
( )Toulene
( )Cyclohexane
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16Formula of chloroform is( )CHCl3
( )CH2Cl2
( )CCl4
( )CH3Cl
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17Vinyl acetylene combines with HCl to form( )Divinylacetylene
( )Poly acetylene
( )Chloroprene
( )Benzene
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18The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with( )Hund's rule
( )Markownikov's rule
( )Pauli's exclusion principle
( )Auf bau principle
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19Synthetic rubber is made by polymerization of( )Chloroform
( )Divinylacetylene
( )Acetylene
( )Butene
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20Beta-beta`-dichloroethyl sulphide is commonly known as( )Laughing gas
( )Mustard gas
( )Bio-gas
( )Phosgene gas
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21When methane reacts with Cl2 in the presence of diffused light the product obtained is/are( )Chloroform
( )Carbon tetrachloride
( )Chloromethane and dichloromethane
( )Mixture of all these
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22Which of the following compounds will not decolourize bromine water( )Ethene
( )Propene
( )Butane
( )Ethyne
Single Answer
23Which of the following reagents distinguishes ethylene from acetylene?( )Aqueous alkaline KMnO4
( )Conc.H2SO4
( )Hydrogenation
( )Ammonical cuprous chloride
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24When a compound X is passed through a dilute alkaline solution of KMnO4 the pink colour of solution is discharged. The compound X is possibly( )Methane
( )Ethene
( )Benzene
( )Ethane
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25Acetylene gives( )White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2
( )White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2Cl2
( )White ppt. with both
( )Red ppt. with both
Single Answer
26The order of reactivity of halogens in aliphatic substitution reactions is( )F2>Br2>Cl2
( )Cl2>Br2>F2
( )Br2>Cl2>F2
( )Cl2>F2>Br2
Single Answer
27Which of the following substances is used as an antiknock compound? ( )Lead tetrachloride
( )Lead acetate
( )Ethyl acetate
( )Tetraethyl lead
Single Answer
28The IUPAC name for compound having the formula (CH3)3C-CH=CH2 is( )3,3-Dimethyl-1-butene
( )1,1,1-Trimethyl-3-propene
( )1,1-Dimethyl-3-butene
( )3,3,3-Trimethyl-1-propene
Single Answer
29For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to( )Oxidation
( )Electrolysis
( )Hydrolysis
( )Hydrogenation
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30In Friedal-Craft's alkylation besides AlCl3 the other reactants are( )C6H6+CH4
( )C6H6+CH3Cl
( )C6H6+NH3
( )C6H6+CH3COCl
Single Answer
31The addition of HBr is easiest with( )CH2=CHCl
( )CH3-CH=CH2
( )ClCH=CHCl
( )(CH3)2C=CH2
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32Which of the following method is most appropriate for the manufacture of methane?( )By reduction of CH2Cl2
( )Wurtz reaction
( )Liquefication of natural gas
( )None of these
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33A fuel has a same knocking property as a mixture of 70 isoctane (2,2,4-trimethyl pentane) and 30% n-heptane by volume. The octane number of the fuel is ( )50
( )70
( )40
( )100
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34Hydrocarbon which is liquid at room temperature is( )Propane
( )Ethane
( )Pentane
( )Butane
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35An organic compound on treatment with Br2 in CCl4 gives bromoderivative of an alkene. The compound will be( )CH3-CH=CH2
( )HC=_CH
( )CH3CH=CHCH3
( )H2C=CH2
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36A salt producing hydrocarbon among these compounds is( )Ethane
( )Ethyne
( )Methane
( )Ethene
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37Marsh gas was the name given to( )Methane
( )Propane
( )Ethane
( )Butane
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38"Each different compound should have a different name" was published by IUPAC system of nomenclature in( )1979
( )1947
( )1892
( )1830
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39CH2=CH-CH=CH2 is( )1,3-butadiene
( )Buta-1,3-diene
( )Both a and b
( )None
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40CnH2n is the general formula of( )Alkanes
( )Alkenes
( )Alkynes
( )None of the above
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41During preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst must be( )Al2O3
( )H2SO4
( )Ni
( )Fe2O3
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42An alkane is produced when an alkyl halide reacts with zinc in the presence of( )HCl
( )CH3COOH
( )Both a and b
( )None of these
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43The method in which alkanes prepared by alkyl halides in the presence of palladium-charcoal is( )Electrolysis
( )Hydrolysis
( )Hydrogenolysis
( )Hydrogenation
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44Kolb's method of alkane production is actually( )Catalysis
( )Hydrogenation
( )Hydrolysis
( )Electrolysis
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45Kolbe's method is not useful for the production of( )Methane
( )Butane
( )Propane
( )Ethane
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46Kolbe's method has limited synthesis applications due to( )Slow reaction
( )Expensive catalysis
( )Salts used are very expensive
( )Number of side products produced
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47The reaction in which ketone is reduced to the alkane is called( )Kolb
( )Clemmensen
( )Cannizaro
( )None
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48The method used only for the production of symmetrical alkanes( )Wolf kishner
( )Clemmensen
( )Cannizzaro
( )Kolbe's method
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49Alkanes containing carbons C18 onwards are( )Liquids
( )Gases
( )Solids
( )Waxy solids
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50Physical properties of alkanes increase with increase of all physical constants except( )Melting points
( )Density
( )Boiling points
( )Solubility
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51The unreactivity of alkanes is based upon( )Inertness of sigma bonds
( )Non-polarity of the bonds
( )Both a and b
( )None of these
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52Complete combustion of alkanes yield( )CO+H2O+heat
( )CO2+H2O+heat
( )CO2+heat
( )CO2+H2O
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53The major reaction occuring in the engines of automobiles is( )Combustion
( )Reduction
( )Oxidation
( )Decomposition
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54Incomplete oxidation of alkanes yields( )CO2+heat
( )CO+heat
( )CO2 and carbon black
( )CO and carbon black
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55Catalytic oxidation of alkanes is used for the preparation of( )Ketones
( )Aldehydes
( )Caboxylic acids
( )Fattyi acids
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56The order of reactivity of halogen acids towards alkenes( )HCl>HBr>HI
( )HBr>HCl>HI
( )HI>HBr>HCl
( )HCl>HBr
Single Answer
57Raney-nickel is the alloy of Ni with( )Pd
( )Pt
( )Cu
( )Al
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58Mustard gas is a( )High melting liquid
( )High boiling liquid
( )Gas
( )Steam
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59During the preapration of alkynes the active metals that react with tetra halo-alkanes are( )Zn
( )Mg
( )Both a and b
( )None
Single Answer
60Alknes are colourless and odourless except( )Pentyne
( )Acetylene
( )Propyne
( )Butyne
Single Answer
61The alkynides are used for the _________of alkynes( )Preparation
( )Purification
( )Separation
( )All the above
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62Common name of CH3-C=_CH is( )Allylene
( )Propargylene
( )Propyne
( )Allyl
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63Ammonical silver nitrate reacts with( )Ethylene
( )Benzene
( )Ethyne
( )2-butyne
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64Ozonolysis of 2-methyl butene-2 yields ( )Aldehyde
( )Ketone
( )Both aldehyde and ketone
( )None of these
Single Answer
65Which of the following will have least hindered rotation about carbon-carbon bond( )Acetylene
( )Hexachloroethene
( )Ethane
( )Ethylene
Single Answer
66Propyne and propene can be distinguished by( )Br2 and CCl4
( )Dil.KMnO4
( )Conc.H2SO4
( )AgNO3 in ammonia
Single Answer
67The compound which reacts with HBr according to Markonikoff's rule is( )H2C=CH2
( )H3C-CH=CH-CH3
( )(CH3)2C=CH2
Single Answer
68A metallic carbide on treatment with water gives out a colorless gas, which burns in air readily and gives a red precipitate with Cu2Cl2 and NH4OH. The gas is( )CH4
( )C2H4
( )C2H6
( )C2H2
Single Answer
69A sample of petrol has the same knocking characteristic as a 60 mL mixture of isooctane and n-heptane mixed in 2:1 (V/V). What is the octane no. of te petrol sample( )66.6
( )76.6
( )86.6
( )56.6
Single Answer
70Which one of the following is the strongest acid( )HC=_CH
( )C2H4
( )C2H6
( )C6H6
Single Answer
71When cyclohexane is proved on water, it floats because( )It is crown form
( )It is boat form
( )It is chair form
( )None of these
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72Which one of the following has the smallest heat of hydrogenation per mole( )2-butene
( )Propene
( )1,3-butadiene
( )1-butene
Single Answer
73The most strained cyclo alkane is( )Cyclopentane
( )Cyclopropane
( )Cyclohexane
( )Cyclobutane
Single Answer
74Which one is not a hydrocarbon( )Antheracene
( )Naphthalene
( )Chloroform
( )Phenanthrene
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75Solid CH4 and benzene are _______solids.( )Molecular
( )Covalent
( )Amorphous
( )Ionic
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76CH3COONa + NaOH-------->CH4 + Na2CO3. This reaction is called( )Methanation reaction
( )Decarboxylation
( )Acid hydrolysis
( )Base hydrolysis
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77CH3 + CH3------>CH3-CH3 is called _________step of chemical reaction( )Endothermic
( )Initiation
( )Propagating
( )Termiinating
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78Ethyl alcohol on ________gives ethene.( )Oxidation
( )Dehdrogenation
( )Hydration
( )Dehydration
Single Answer
79When H2SO4 is heated with excess of ethanol at 140 degree celsius. The major product is( )Alcohol
( )Ether
( )Ethene
( )Ketone
Single Answer
80Which one decolourizes Bayers reagent and bromine water( )Ethene
( )Ethyne
( )Both a and b
( )Benzene
Single Answer
81Metallic ethynides are formed by the reaction of _________with ammonical silver nitrate or ammonical cuprous chloride.( )Benzene
( )Ethene
( )Acetylene
( )Ethanoic acid
Single Answer
82Which statement is true regarding reactivity( )Alkenes do not undergo addition reactions
( )Towards the addition reaction alkenes are more reactive than alkynes
( )Alkenes decolourize bromine solution and Baeyer's reagent but alkynes do not
( )Double bond is stronger than single bond hence alkenes are less reactive than alkanes
Single Answer
83Reaction of 2-butene with HBr gives only one product because( )The molecule is symmetrical around C=C bond
( )The molecule is asymetrical around C=C bond
( )It is more stable
( )It is less stable
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84Reaction of Br2 with Ethene is an example of ____________reaction( )Nucleophilic addition
( )Electrophilic substitution
( )Electrophilic addition
( )Free radical addition
Single Answer
85Bromoethane can be converted to ethene by( )Reaction with aq.KOH
( )Oxidation
( )Reduction
( )Reaction with alcoholic KOH
Single Answer
86During pyrolysis which bond will break rapidly( )C-H
( )C=C
( )C-C
( )C=_C
Single Answer
87Ozonolysis of ethene produces( )Ether
( )Ketone
( )Aldehyde
( )Mixture of a and b
Single Answer
88Ozonolysis reaction with an alkene produces one mole of HCHO and CH3CHO each. What is the name of this alkene?( )Butylene
( )Propylene
( )Pentene
( )Ethylene
Single Answer
89Which alkene on acid catalysed hydration forms t-butyl alcohol?( )CH3CH=CH-CH3
( )CH3-CH=CH2
( )CH3CH2CH=CH2
( )CH3-C(CH3)=CH2
Single Answer