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Online Tests
ECAT Chemistry Chapter 21 Alkyl Halides Online Test MCQs With Answers
Question # 1
The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to
Choose an answer
4-Bromobenzyl cyanide
4-Cyanobenzyl chloride
4-Cyanobenzyle cyanide
4-Bromo 2-cyanobenzyl chloride
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Question # 2
Benzene reacts with chlorine to form benzene hexachloride in presence of
Choose an answer
Nickel
AlCl
3
Bright sunlight
Zinc
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Question # 3
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 # 4
Choose an answer
Primary alkyl halide
Secondary alkyl halide
Tertiary alkyl halide
None of these
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Question # 5
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 # 6
E
1
mechanism is generally shown by
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1° - RX
2° - RX
3° - RX
None of these
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Question # 7
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 # 8
If Grignard reagent is allowed to react with another alkyl halide the main product is
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An alkane
Cyclo alkane
Alkyne
An alkene
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Question # 9
The rate of E
1
reaction depends upon:
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The concentration of substrate
The concentration of nucleophile
The concentration of substrate as well as nucleophile
None of these
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Question # 10
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 # 11
Which of the following compounds on oxidation gives benzoic acid?
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Chlorophenol
Chlorotoluene
Chlorobenzene
Benzyl chloride
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Question # 12
When CO
2
is made to react with ethyl megnesium iodine, followed by hydrolysis, the product formed is:
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Propane
Propanoic acid
Propanal
Propanol
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Question # 13
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 # 14
Unpleasant smell of carbylamine is obtained when chloroform and alcoholic KOH are heated with
Choose an answer
Any aromatic amine
Any primary amine
Any amine
Any aliphatic amine
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Question # 15
E
2
has molecularity :
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One
Two
Three
Half
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Question # 16
Which of the following undergoes uncleophilic substitution exclusively by S
N
1 mechanism?
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Benzyl chloride
Ethyl chloride
Chlorobenzene
Isopropyl choride
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Question # 17
Chlorobenzene on heating with aqueous NH
3
under pressure in the presence of cuprous chloride gives
Choose an answer
Benzamide
Nitrobenzene
Aniline
Chloroaminobenzene
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Question # 18
Grignad reagent is reactive due to
Choose an answer
The presence of halogen atom
The presence of Mg atom
The polarity of C - Mg bond
None of above
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Question # 19
Which halide among the following is used as methylating agent?
Choose an answer
CH
3
l
C
2
H
5
Cl
C
2
H
5
Br
C
6
H
5
Cl
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Question # 20
Butanenitrile is formed by reaction of KCN with
Choose an answer
Propyl alcohol
Butyl chloride
Butyl alcohol
Propyl Chloride
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Question # 21
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 # 22
Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?
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HCl + anhyd. Zncl
2
NaCl
PCl
5
SOCl
2
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Question # 23
Tertiary alkyl halides are practically inert to substitution by S
N
2 mechanism because of
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Onsolubility
Instability
Inductive effect
Steric hindrance
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Question # 24
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 # 25
When formaldehyde is added to Grignard reagent we get
Choose an answer
Aldehyde
Acetone
Primary alcohol
Secondary alcohol
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Question # 26
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 # 27
Iodoethane reacts with sodium in ether, the product formed is
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Pentene
Propyne
Butene
Butane
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Question # 28
In a primary alkyl halide, the halogen atom is attached to a carbon which is further attached to
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Only one carbon atom
Two carbon atoms
Three carbon atoms
one or no carbon atom
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Question # 29
Ethyl bromide on treatment with alcoholic KOH gives
Choose an answer
Ethylene
Ethanol
Acetic Acid
Ethane
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Question # 30
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 # 31
Grignard reagent is not prepared in aqueous medium but prepared in ether medium because
Choose an answer
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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