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Online Tests
ECAT Chemistry Chapter 21 Alkyl Halides Online Test MCQs With Answers
Question # 1
Which one of the following will have the maximum dipole moment
Choose an answer
CH
3
F
CH
3
Cl
CH
3
Br
CH
3
l
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Question # 2
Thre rate of S
N
2 reaction depends upon the
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Concentration of alkyl halides
Concentration of nucleophile
Concentration of alkyl halides and nucleophile
None of the above
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Question # 3
Dehydrohalogenation of alkyl halides give
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Alkanes
Alkenes
Alkynes
Alkdehyde
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Question # 4
Ethyl alcohol gives ethyl chloride with the help of
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SOCl
2
NaCl
Cl
2
KCl
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Question # 5
Which bond is most stable
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C - Cl
C - F
C - Br
C - I
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Question # 6
Carbon atom holding halogen in aryl halides is
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sp
2
-hybridesed
sp
3
-hybridesed
sp-hybridesed
sp
3
d-hybridesed
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Question # 7
DDT is formed from
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Benzene and Chlorobenzene
Chloral and Chlorobenzene
Chloral and Benzene
Chlorobenzene and chlorine
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Question # 8
The order of reactivity for a given halogen in Grignard's reagent is:
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CH
3
X > C
2
H
5
X > C
3
H
4
X > C
4
H
4
X
C
2
H
5
X > C
3
H
7
X > C
4
H
5
X > CH
4
X
C
3
H
7
X > C
4
H
7
X > CH
3
X > C
2
H
5
X
C
4
H
4
X > C
3
H
7
X > C
2
H
5
X > CH
4
X
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Question # 9
Gammexane is
Choose an answer
Chlorobenzene
Benzyl chloride
Brommobenzene
Benzene hexachloride
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Question # 10
Ethyl bromide is formed by the reaction of HBr with
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Ethane
Ethene
Ethyne
Propane
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Question # 11
Among the following the most reactive towards alcoholic KOH is
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CH
2
= CHBr
CH
3
COCH
2
CH
2
Br
CH
3
CH
2
Br
CH
3
CH
2
CH
2
Br
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Question # 12
Grignard reagent is reactive due to :
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The presence of halogen atom
The presence of Mg atom
The polarity of C - Mg bond
None of them
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Question # 13
The reaction of an alkyl halide with RCOOAg produces
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Ester
Ether
Aldehyde
Ketone
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Question # 14
When metallic sodium in ether is heated with ethyl chloride, which alkane is formed
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Propane
Ethane
Iso-butane
N-butane
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Question # 15
A carbon atom carrying a postitive charge and attached to three other atoms of groups is called
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Caronium ion
Carbanion
Oconium ion
Carba ion
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Question # 16
Which reaction is example of nucleophilic substitution
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Question # 17
C
6
H
6
Cl
6
can be obtained from
Choose an answer
HCl and Benzene
Cl
2
and Benzene and AlCl
3
Cl
2
and Benzene in diffused light
NaOCl and Benzene
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Question # 18
When alkyl halide is heated with aqueous solution of ammonia at 100°C the major product is
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Primary amine
Secondary amine
Tertiary amine
Mixture of amines and salt
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Question # 19
Any other aldehyde except formaldehyde on reaction with Grignard's will produce
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Secondary alcohol
Primary alcohol
Tertiary alcohol
Aromatic alcohol
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Question # 20
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Electrophilic substitution
Free radical reduction
Isomerisation
Nucleophilic substitution
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Question # 21
Alkyl halides are reactive :
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High
Medium
Less
Least
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Question # 22
1-Chlorobutane on reaction with alcoholic potash gives
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But 1-ene
Butan-1-ol
But-2-ene
Butan-2-ol
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Question # 23
Which of the following chlorocompounds is heat easily hydrolysed by hydorxide ion to give the product indicated
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Question # 24
The rate of E
1
reaction depends upon:
Choose an answer
The concentration of substrate
The concentration of nucleophile
The concentration of substrate as well as nucleophile
None of these
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Question # 25
The elimination of hydrogen halide from adjacent carbon atoms is called
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Dehydrogenation
Hydrogenation
Dehydrohalogenation
Hydrohalogenation
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Question # 26
Grignard's reagent was prepared in:
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1900
1910
1920
1930
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Question # 27
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Electrophilic addition
Electrophilic substitution
Free radical substitution
Nuclophilic addition
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Question # 28
An electrophile may be
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Positive
Negative
Neutral
Both c and a
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Question # 29
The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is
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Iodide > bromide > chloride
Chloride > bromide > iodide
Bromide > chloride > iodide
Bromide > iodide > chloride
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Question # 30
2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is
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2-Ethoxypentane
Pent-1-ene
cis-Pent-2-ene
trans-Pent-2-ene
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Question # 31
How many monochlorobutanes will be possible on chlorination of n-butane?
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1
2
3
5
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