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ECAT Chemistry Chapter 19 Aliphatic Hydrocarbons Online Test MCQs With Answers
Question # 1
The difference between amount of heat actually released and that of calculated is called
Choose an answer
Bonding energy
Activation energy
Resonance energy
Transition energy
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Question # 2
Write the name of following compound
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5 - methyle - 2- hexene
2 - methyle hexene
4 - ethyle - 2 - methyle hexene
3 - ethyle - 3 - methyl hexene
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Question # 3
The major reaction occurring in the engines of automobiles is
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Oxidation
Reducing
Combustion
Decomposition
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Question # 4
Alkyl halides when reduced with nascent hydrogen in the presence of Zn + HCI, are converted to
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Alkynes
Alkenes
Alkanes
Alcohol
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Question # 5
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Pent -1-ene-3-yne
2-pentyne-4-ene
1-pentene-3-yne
Pent-2-yen-4-ene
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Question # 6
Which one of following is not monocyclic aromatic hydrocarbon
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Benzaldehyde
Benzoic acid
Benzene sulfonic acid
Biphenyl
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Question # 7
Sulphuric acid generates nitronium ion by reacting with
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Nitric acid
Nitrogen gas
Nitrous acid
Potassium nitrate
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Question # 8
An organic compound, on treatment with Br2 in CC14 gives bromoderivative of an alkene. The compound will be
Choose an answer
CH3 - CH = Ch2
CH3CH = CHCH3
HC = CH
H2C = CH2
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Question # 9
When methane reacts with Cl
2
in the presence of diffused light the products obtained are?
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Chloroform only
Carbon tetrachloride only
Chloromethane and dichloromethane
Mixture of a,b,c
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Question # 10
The saturated hydrocarbons usually end with suffix ______
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Ane
Ene
Yne
Oic
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Question # 11
Which is symmetric alkene?
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CH=C-CH
2
CH
≡CH
CH
3
-C
≡C - CH
3
B and C
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Question # 12
Preparation of vegetable ghee involves
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Halogenations
Hydrogenations
Hydroxylation
Dehydrogenations
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Question # 13
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 # 14
The general formula of alkane is
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C
n
H
2n+2
C
n
H
n
C
n
H
2n
C
2
H
2n-1
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Question # 15
Alkanes are gases :
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C
1
-C
4
C
5
-C
10
C
11
-C
15
C
10
-C
20
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Question # 16
The addition of HBr is easiest with
Choose an answer
CH2 = CHCl
CICH = CHCl
CH3 - CH = CH2
(CH3)2 C = CH2
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Question # 17
Benzene was discovered by Michael Faraday's in
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1824
1825
1826
1827
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Question # 18
Hydrocarbons are divided into aliphatic, alicyclic and aromatic which structure among the following show an alicyclic hydrocarbon
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Question # 19
Meta directing group decreased the ----------- of benzene ring
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Physical activity
Chemical reactivity
Density
None
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Question # 20
Choose an answer
2-bromonitrobenzene
2-nitrobromobenzene
1-bromonitrobenzene
1-nitrobromobenzene
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Question # 21
Alkenes combine readily with electrophillic reagents such as halogens giving
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Haloalkanes
Gem-dihalides
Vicinal dihalides
Vinyl halides
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Question # 22
All C - H bond lengths of benzene ring is
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1.07A
°
1.09A
°
1.08A
°
None
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Question # 23
Vinyl acetylene combines with HCl to form:
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Polyacetylene
Benzene
Chloroprene
Divinyl acetylene
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Question # 24
A six membered ring containing one double bond called
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Cyclohexene
Cyclohexane
Cyclohexadiene
None
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Question # 25
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 # 26
Which one of the following is (m-xylene)
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1,2 dimethyl benzene
1,3 dimethyl benzene
1,5 dimethyl benzene
1,4 dimethyl benzene
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Question # 27
Zn + HCI are used in
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Clemenson reduction
Wof kishner reduction
Kolb's electrolysis
Wutruz reaction
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Question # 28
The reaction in which ketone is reduced to the alkane is called
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Kolb
Clemmensen
Cannizzaro
None
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Question # 29
Marsh gas was the name given to
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Methane
Ethane
Propane
Butane
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Question # 30
Acetylene is used in the manufacture of
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Rubber
Plastic
Ethyle alcohol
All of these
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