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ECAT Chemistry Chapter 21 Alkyl Halides Online Test MCQs With Answers
Question # 1
Which one of the following is not a nuclelphile
Choose an answer
H
2
O
H
2
S
BF
3
NH
3
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Question # 2
When primary amine reacts with chloroform in ethanolic KOH, then the product is
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An isocyanide
An aldehyde
A cyanide
An alcohol
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Question # 3
By simply reacting Grignand's reagent with water we get
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An alkane
Higher alkane
An alkene
An alkyne
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Question # 4
which one of the following is not a nucleophile?
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H
2
O
H
2
S
BF
3
NH
3
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Question # 5
When CO
2
is made to react with ethyl magnesium iodide, followed by acid hydrolysis, the product formed is
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Propane
Propanoic acid
Propanal
Propanol
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Question # 6
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 # 7
Grignard reagent is not prepared in aqueous medium but prepared in ether medium because
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The reagent is highly reactive in ether
The reagent does not react with water
The reagent becomes inactive in water
The reagent reacts with water
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Question # 8
SN
2
reaction has order of reaction :
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First
Second
Third
Zero
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Question # 9
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Electrophilic substitution
Free radical reduction
Isomerisation
Nucleophilic substitution
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Question # 10
The reactivity order of alkyl halides for a paricular alkyl group is
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Fluoride > chloride > bromide > iodide
Chloride > bromide > fluoride > iodide
Iodide > bromide > chloride > fluoride
Bromide > iodide > chloride > fluoride
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Question # 11
When ethyl iodide and n-propyl iodide are allowed to react with sodium metal in ether, the number of alkanes that could be produced is
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Only one
Two alkanes
Three alkanes
Four alkanes
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Question # 12
Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to
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The formation of less stable carbonium ion
Resonance stabilization
Larger carbon-halogen bond
The inductive effect
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Question # 13
The reactivity order of alkyl halides for a particular alkyl group is:
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F >Cl>Br>I
Cl>Br>F>l
l>Br>Cl>F
Br>l>Cl>F
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Question # 14
For the carbylamine reaction we need hot alc.KOH and
Choose an answer
Any amin and chloroform
Chloroform and Ag powder
A primary amine and chloroform
A mono alkyl amine and trichlorom-ethane
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Question # 15
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 # 16
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Electrophilic addition
Electrophilic substitution
Free radical substitution
Nuclophilic addition
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Question # 17
Alkyle halides can be prepared by treating halogen acids with
Choose an answer
Ethane
Ethanol
Ethene and ethanol
Aldehyde
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Question # 18
The general formula of alkyl halides is
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C
n
H
2n
X
C
n
H
2n-1
X
C
n
H
2n+1
X
C
n
H
2n-2
X
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Question # 19
Which of the following does not give iodoform test?
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Ethanol
Ethanal
Acetophenone
Bezophenone
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Question # 20
Which of the followings is not a nulceophile
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OH
-
NH
3
C
2
H
5
O
-
Br
2
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Question # 21
The order of reactivity for a given halogen in Grignard's reagent is:
Choose an answer
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 # 22
Ethyl chloride on treatment with aqueous alkali gives
Choose an answer
Ethane
Ethene
Ethanal
Ethanol
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Question # 23
Grignard's reagent on treatment with carbonyl compounds yield
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Pheonol
Alcohol
Alkane
None of these
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Question # 24
Allyl chloride on dehydrochlorination gives
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Propadiene
Propylene
Allyl alcohol
Acetone
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Question # 25
S
N
1 reaction of alkylhalides leads to
Choose an answer
Retention of configuration
Recemisation
Inversion of configuration
None of these
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Question # 26
Most reactive halide towards S
N
1 reaction is
Choose an answer
n-Butyl chloride
sec-Butyl chloride
tert-Butyl choride
Allyl chloride
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Question # 27
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 the above
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Question # 28
Cl
2
reacts with CS
2
in presence of AlCl
3
to form
Choose an answer
CHCl
3
CCl
4
C
2
H
5
Cl
C
2
H
6
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Question # 29
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 # 30
Which of the following chlorocompounds is heat easily hydrolysed by hydorxide ion to give the product indicated
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Question # 31
1, 3-Dibromopropane reacts with metallic zinc to form
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Propene
Propane
Cyclopropane
Hexane
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