Aliphatic Hydrocarbons

Aliphatic Hydrocarbons

No

Questions

1

Hydrogenation 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

2

3

4

5

( )

Kolbe's reaction

( )

Cannizaro's reaction

( )

Haloform resction

( )

Sabatier-senderens reaction

Water gas is produced by treating methane with ( )

H2SO4

( )

NaOH

( )

H2O

( )

HCl

Alhyl halides when reduced with nascent hydrogen in the presence of Zn+HCl are converted to ( )

Alkenes

( )

Alcohol

( )

Alkanes

( )

Alkynes

When 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

Ethylene can be prepared in the laboratory by heating together ethyl alcohol and ( )

Phenol

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6

7

8

9

10

( )

H2SO4

( )

HCl

( )

HF

Alkenes combine readily with electrophilic reagents such as halogens giving ( )

Vicinal dihalides

( )

Haloalkanes

( )

Vinyl halides

( )

Gem-dihalides

Ethyl hydrogen sulphate on hydrolysis with boiling water is converted to ( )

Methyl alcohol

( )

Propyl alcohol

( )

Ethylene

( )

Ethyl alcohol

Ethylene combines with water in the presence of H2SO4 + HgSO4 and forms ( )

Ethyl chloride

( )

Ethyl alcohol

( )

Carboxylic acid

( )

None of these

When ethene is passed through a dilute solution of KMnO4 the pink colour changes to ( )

Colourless

( )

Red

( )

Green

( )

Blue

Ethylene polymerizes at 100 atm pressure and 400 degree Celsius to give ( )

Polyalcohol

( )

Polyethylene

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11

12

13

14

15

( )

Polybenzene

( )

Polypropylene

Ethylene decolourizes dilute solution of KMnO4. This test is known as ( )

Silver mirror test

( )

Colouration test

( )

Ring test

( )

Baeyer's test

Which gas is produced by treating CaC2 with water ( )

HCl

( )

Methane

( )

Ethane

( )

Acetylene

Which gas is used for welding purposes ( )

Acetylene

( )

Nitrogen

( )

Methane

( )

Butane

Acetylene is used in the manufacture of ( )

Rubber

( )

Plastic

( )

Ethyl alcohol

( )

All these

When 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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16

17

18

19

20

21

Formula of chloroform is ( )

CHCl3

( )

CH2Cl2

( )

CCl4

( )

CH3Cl

Vinyl acetylene combines with HCl to form ( )

Divinylacetylene

( )

Poly acetylene

( )

Chloroprene

( )

Benzene

The 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

Synthetic rubber is made by polymerization of ( )

Chloroform

( )

Divinylacetylene

( )

Acetylene

( )

Butene

Beta-beta`-dichloroethyl sulphide is commonly known as ( )

Laughing gas

( )

Mustard gas

( )

Bio-gas

( )

Phosgene gas

When methane reacts with Cl2 in the presence of diffused light the product obtained is/are

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22

23

24

25

26

( )

Chloroform

( )

Carbon tetrachloride

( )

Chloromethane and dichloromethane

( )

Mixture of all these

Which of the following compounds will not decolourize bromine water ( )

Ethene

( )

Propene

( )

Butane

( )

Ethyne

Which of the following reagents distinguishes ethylene from acetylene? ( )

Aqueous alkaline KMnO4

( )

Conc.H2SO4

( )

Hydrogenation

( )

Ammonical cuprous chloride

When 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

Acetylene 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

The order of reactivity of halogens in aliphatic substitution reactions is

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28

29

30

31

( )

F2>Br2>Cl2

( )

Cl2>Br2>F2

( )

Br2>Cl2>F2

( )

Cl2>F2>Br2

Which of the following substances is used as an antiknock compound? ( )

Lead tetrachloride

( )

Lead acetate

( )

Ethyl acetate

( )

Tetraethyl lead

The 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

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to ( )

Oxidation

( )

Electrolysis

( )

Hydrolysis

( )

Hydrogenation

In Friedal-Craft's alkylation besides AlCl3 the other reactants are ( )

C6H6+CH4

( )

C6H6+CH3Cl

( )

C6H6+NH3

( )

C6H6+CH3COCl

The addition of HBr is easiest with ( )

CH2=CHCl

( )

CH3-CH=CH2

( )

ClCH=CHCl

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( ) 32

33

34

35

36

(CH3)2C=CH2

Which 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

A 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

Hydrocarbon which is liquid at room temperature is ( )

Propane

( )

Ethane

( )

Pentane

( )

Butane

An 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

A salt producing hydrocarbon among these compounds is ( )

Ethane

( )

Ethyne

( )

Methane

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( ) 37

38

39

40

41

42

Ethene

Marsh gas was the name given to ( )

Methane

( )

Propane

( )

Ethane

( )

Butane

"Each different compound should have a different name" was published by IUPAC system of nomenclature in ( )

1979

( )

1947

( )

1892

( )

1830

CH2=CH-CH=CH2 is ( )

1,3-butadiene

( )

Buta-1,3-diene

( )

Both a and b

( )

None

CnH2n is the general formula of ( )

Alkanes

( )

Alkenes

( )

Alkynes

( )

None of the above

During preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst must be ( )

Al2O3

( )

H2SO4

( )

Ni

( )

Fe2O3

An alkane is produced when an alkyl halide reacts with zinc in the

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presence of

43

44

45

46

47

( )

HCl

( )

CH3COOH

( )

Both a and b

( )

None of these

The method in which alkanes prepared by alkyl halides in the presence of palladium-charcoal is ( )

Electrolysis

( )

Hydrolysis

( )

Hydrogenolysis

( )

Hydrogenation

Kolb's method of alkane production is actually ( )

Catalysis

( )

Hydrogenation

( )

Hydrolysis

( )

Electrolysis

Kolbe's method is not useful for the production of ( )

Methane

( )

Butane

( )

Propane

( )

Ethane

Kolbe's method has limited synthesis applications due to ( )

Slow reaction

( )

Expensive catalysis

( )

Salts used are very expensive

( )

Number of side products produced

The reaction in which ketone is reduced to the alkane is called ( )

Kolb

( )

Clemmensen

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48

49

50

51

52

( )

Cannizaro

( )

None

The method used only for the production of symmetrical alkanes ( )

Wolf kishner

( )

Clemmensen

( )

Cannizzaro

( )

Kolbe's method

Alkanes containing carbons C18 onwards are ( )

Liquids

( )

Gases

( )

Solids

( )

Waxy solids

Physical properties of alkanes increase with increase of all physical constants except ( )

Melting points

( )

Density

( )

Boiling points

( )

Solubility

The unreactivity of alkanes is based upon ( )

Inertness of sigma bonds

( )

Non-polarity of the bonds

( )

Both a and b

( )

None of these

Complete combustion of alkanes yield ( )

CO+H2O+heat

( )

CO2+H2O+heat

( )

CO2+heat

( )

CO2+H2O

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53

54

55

56

57

58

The major reaction occuring in the engines of automobiles is ( )

Combustion

( )

Reduction

( )

Oxidation

( )

Decomposition

Incomplete oxidation of alkanes yields ( )

CO2+heat

( )

CO+heat

( )

CO2 and carbon black

( )

CO and carbon black

Catalytic oxidation of alkanes is used for the preparation of ( )

Ketones

( )

Aldehydes

( )

Caboxylic acids

( )

Fattyi acids

The order of reactivity of halogen acids towards alkenes ( )

HCl>HBr>HI

( )

HBr>HCl>HI

( )

HI>HBr>HCl

( )

HCl>HBr

Raney-nickel is the alloy of Ni with ( )

Pd

( )

Pt

( )

Cu

( )

Al

Mustard gas is a ( )

High melting liquid

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59

60

61

62

63

( )

High boiling liquid

( )

Gas

( )

Steam

During the preapration of alkynes the active metals that react with tetra halo-alkanes are ( )

Zn

( )

Mg

( )

Both a and b

( )

None

Alknes are colourless and odourless except ( )

Pentyne

( )

Acetylene

( )

Propyne

( )

Butyne

The alkynides are used for the _________of alkynes ( )

Preparation

( )

Purification

( )

Separation

( )

All the above

Common name of CH3-C=_CH is ( )

Allylene

( )

Propargylene

( )

Propyne

( )

Allyl

Ammonical silver nitrate reacts with ( )

Ethylene

( )

Benzene

( )

Ethyne

( )

2-butyne

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64

65

66

67

68

69

Ozonolysis of 2-methyl butene-2 yields ( )

Aldehyde

( )

Ketone

( )

Both aldehyde and ketone

( )

None of these

Which of the following will have least hindered rotation about carboncarbon bond ( )

Acetylene

( )

Hexachloroethene

( )

Ethane

( )

Ethylene

Propyne and propene can be distinguished by ( )

Br2 and CCl4

( )

Dil.KMnO4

( )

Conc.H2SO4

( )

AgNO3 in ammonia

The compound which reacts with HBr according to Markonikoff's rule is ( )

H2C=CH2

( )

H3C-CH=CH-CH3

( )

(CH3)2C=CH2

A 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

A 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

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octane no. of te petrol sample

70

71

72

73

74

( )

66.6

( )

76.6

( )

86.6

( )

56.6

Which one of the following is the strongest acid ( )

HC=_CH

( )

C2H4

( )

C2H6

( )

C6H6

When cyclohexane is proved on water, it floats because ( )

It is crown form

( )

It is boat form

( )

It is chair form

( )

None of these

Which one of the following has the smallest heat of hydrogenation per mole ( )

2-butene

( )

Propene

( )

1,3-butadiene

( )

1-butene

The most strained cyclo alkane is ( )

Cyclopentane

( )

Cyclopropane

( )

Cyclohexane

( )

Cyclobutane

Which one is not a hydrocarbon ( )

Antheracene

( )

Naphthalene

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75

76

77

78

79

( )

Chloroform

( )

Phenanthrene

Solid CH4 and benzene are _______solids. ( )

Molecular

( )

Covalent

( )

Amorphous

( )

Ionic

CH3COONa + NaOH-------->CH4 + Na2CO3. This reaction is called ( )

Methanation reaction

( )

Decarboxylation

( )

Acid hydrolysis

( )

Base hydrolysis

CH3 + CH3------>CH3-CH3 is called _________step of chemical reaction ( )

Endothermic

( )

Initiation

( )

Propagating

( )

Termiinating

Ethyl alcohol on ________gives ethene. ( )

Oxidation

( )

Dehdrogenation

( )

Hydration

( )

Dehydration

When H2SO4 is heated with excess of ethanol at 140 degree celsius. The major product is ( )

Alcohol

( )

Ether

( )

Ethene

( )

Ketone

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80

81

82

83

84

Which one decolourizes Bayers reagent and bromine water ( )

Ethene

( )

Ethyne

( )

Both a and b

( )

Benzene

Metallic ethynides are formed by the reaction of _________with ammonical silver nitrate or ammonical cuprous chloride. ( )

Benzene

( )

Ethene

( )

Acetylene

( )

Ethanoic acid

Which 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

Reaction 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

Reaction of Br2 with Ethene is an example of ____________reaction ( )

Nucleophilic addition

( )

Electrophilic substitution

( )

Electrophilic addition

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( ) 85

86

87

88

89

Free radical addition

Bromoethane can be converted to ethene by ( )

Reaction with aq.KOH

( )

Oxidation

( )

Reduction

( )

Reaction with alcoholic KOH

During pyrolysis which bond will break rapidly ( )

C-H

( )

C=C

( )

C-C

( )

C=_C

Ozonolysis of ethene produces ( )

Ether

( )

Ketone

( )

Aldehyde

( )

Mixture of a and b

Ozonolysis reaction with an alkene produces one mole of HCHO and CH3CHO each. What is the name of this alkene? ( )

Butylene

( )

Propylene

( )

Pentene

( )

Ethylene

Which alkene on acid catalysed hydration forms t-butyl alcohol? ( )

CH3CH=CH-CH3

( )

CH3-CH=CH2

( )

CH3CH2CH=CH2

( )

CH3-C(CH3)=CH2

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