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