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ECAT Chemistry Chapter 19 Aliphatic Hydrocarbons Online Test MCQs With Answers
Question # 1
Formula of chloroform is
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CH
3
CI
CCI
4
CH
2
CI
2
CHCI
3
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Question # 2
Incomplete oxidation of alkanes yields
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CO
2
& carbon black
CO
2
+ heat
CO and carbon black
CO + heat
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Question # 3
Preparation of vegetable ghee involves
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Halogenations
Hydrogenations
Hydroxylation
Dehydrogenations
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Question # 4
The presence of a double bond in a compound is the sign of
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Saturation
Unsaturation
Substitution
None of above
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Question # 5
Hydrocarbons are organic compounds which contain elements such as
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Hydrogen
Carbon
Hydrogen and carbon
Halogens
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Question # 6
For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to
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Hydrolysis
Oxidation
Hydrogenation
Electrolysis
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Question # 7
In Friedal-Craft's alkylation besides AlCl3 the other reactants are
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C6H6 + NH3
C6H6 + NH4
C6H6 + CH3Cl
C6H6 + CH3COCl
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Question # 8
When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give
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Benzene
Cyclohexene
Benzene
Toluene
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Question # 9
Synthesis of rubber is made by polymerization of
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Chloroform
Acetylene
Divinylacetylene
Butene
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Question # 10
the unreactivity of alkanes is based upon
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Inertness of sigma bond
Non-polarity of the bonds
Both A and B
None of above
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Question # 11
The correct order of reactivity of halogens with alkanes is
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l
2
> Br
2
> Cl
2
> F
2
l
2
> Cl
2
> F
2
> Br
2
F
2
> Cl
2
> l
2
> Br
2
F
2
> Cl
2
> Br
2
> l
2
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Question # 12
Most common reactions of benzene and its derivatives are
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electrophilic addition reactions
electrophilic substitution reactions
Nucleophilic addition reactions
Nucleophilic subtitution reactions
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Question # 13
Alkyne is :
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CH
3-
CH
3
CH
4
CH
2=
CH
2
C
2
H
2
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Question # 14
The addition of unsymmetrical reagent to unsymmetrical alkene is in accordance with the rule:
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Hund's rule
Markownikov's rule
Pauli's Exclusion Principle
Auf bau Principle
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Question # 15
Toluene is also called
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Hydroxyl benzene
Methyl benzene
ethyl benzene
None
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Question # 16
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2, 3-dimethylbutane
2, 3-methylbutane
2-dimethylbutane
Dimethylbutane
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Question # 17
During reaction of O
2
and alkenes, a product:
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Glycol
Epxide
Halohydrin
Ethylene glycol
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Question # 18
The method used only for the production of symmetrical alkanes
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Kolb's method
Clemmenen
Cannizzaro
Wolf kishner
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Question # 19
Nitroalkane are used in
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Fuel
Solvents
Organic synthesis
All of them
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Question # 20
Hydrocarbons are divided into aliphatic, alicyclic and aromatic which structure among the following show an alicyclic hydrocarbon
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Question # 21
"Each different compound should have a different name" was published by IUPAC system of nomenclature in
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1892
1830
1947
1979
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Question # 22
Which decolourizes the colour of Br
3
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CH
4
CH
3-
CH
3
CH
3-
CH
3-
CH
3
CH
2=
CH
2
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Question # 23
Which of the following method is most appropriate for the manufacture of methane?
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By reduction of CH2CL2
Wurtz reaction
Liquification of natural gas
None of these
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Question # 24
Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively
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Zinc dust and soda lime
Soda time and zinc dust
Zinc dust and sodium hydroxide
Soda lime and copper
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Question # 25
The major reaction occurring in the engines of automobiles is
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Oxidation
Reducing
Combustion
Decomposition
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Question # 26
Hybridization of each carbon atom in benzene ring is
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sp hybridized
sp
2
hybridized
sp
3
dsp
2
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Question # 27
Ethylene can be prepared in the laboratory by heating together ethyl alcohol and
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HCI
Phenol
HF
H
2
SO
4
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Question # 28
Which of the following reaction is characteristic of benzene
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Electrophilic substitution reaction
Reduction
Oxidation
Ozonolysis
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Question # 29
The benzene molecule contains
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Three double bonds
Two double bonds
One double bonds
Delocalizedπ-electron charge
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Question # 30
Hydrogenation of alkenes/alkynes inthe presence of Ni as catalyst at 3000°C result in the formation of corresponding alkanes. This reaction is known as
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Sabatier-senderens reaction
kolbes reaction
Cannizaro's reaction
Haloform reaction
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Question # 31
Hydrocarbon which is liquid at room temperature is
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Pentane
Butane
Propane
Ethane
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