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ECAT Chemistry Chapter 21 Alkyl Halides Online Test MCQs With Answers
Question # 1
Ethyl chloride on treatment with aqueous alkali gives
Choose an answer
Ethane
Ethene
Ethanal
Ethanol
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Question # 2
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 # 3
By reaction Grignard's reagent with the HCHO we get
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1° - alcohol
2° - alcohol
3° - alcohol
All of these
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Question # 4
Hydrolysis of Grignard's reagent yields
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Alcohol
Aldyhyde
Ester
Alkane
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Question # 5
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 # 6
The final product formed by distilling ethyl alcohol with excess of Cl
2
and Ca(OH)
2
is
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CH
3
CHO
CCl
3
CHO
CHCl
3
(CH
3
)
2
O
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Question # 7
Grignard's reagent is
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Alkyl halide
Magnesium halide
Alkyl magnesium halide
Ethereal solution of an alkyl halide
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Question # 8
Reaction of ethylamine with chloroform in alcoholic KOH produces
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CH
3
OH
CH
3
NC
C
2
H
5
NC
C
2
H
5
CN
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Question # 9
Alkyl halides are considered to be very reactive compounds towards nucleophiles because
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They have an electrophilic carbon
They have an electrophilic carbon and a good leaving group
They have an electrophilic carbon and a bad leaving group
They have a nucleophilic carbon and a good leaving group
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Question # 10
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 # 11
The reactivity order of alkyl halides for a paricular alkyl group is
Choose an answer
Fluoride > chloride > bromide > iodide
Chloride > bromide > fluoride > iodide
Iodide > bromide > chloride > fluoride
Bromide > iodide > chloride > fluoride
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Question # 12
Iodoethane reacts with sodium in ether, the product formed is
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Pentene
Propyne
Butene
Butane
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Question # 13
Which reaction is example of nucleophilic substitution
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Question # 14
Reation of which with Grignard's reagent gives primary alcohol:
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Formaldehyde
Aldehyde
Ketones
Acetone
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Question # 15
Cyanoform is ________ acid in nature than the chloroform. The missing word is
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Stronger
Weaker
Amphoteric
Neutral
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Question # 16
Which of the following reacts with chloroform and base to form phenyl isocynaide?
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Nitrobenzene
Phenol
Chlorobenzene
Aniline
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Question # 17
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 # 18
The alkyl halide is converted into an alcohol by
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Addition
Substitution
Dehydrohalogenation
Elimination
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Question # 19
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 # 20
Action of Zn with alkyl halides in the presence of an inert solvent forms higher alkanes. This reaction is known as
Choose an answer
Wurtz reaction
Frankland's reaction
Cannizaro reaction
Kalobe's reaction
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Question # 21
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 # 22
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 # 23
Alkyl halides are considered to be very reactive compounds towards nucleophiles, because:
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They have an electrophilic carbon
They have an electrophilic carbon and good living gorup
They have an electrophilic carbon and bad living group
They have an nucleophilic carbon and good living gorup
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Question # 24
Grignard reagent is prepared by the reaction of magnesium metal with alkyl halide in the presence of
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Alcohol
Water
Suephuric acid
Dry ether
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Question # 25
In primary alkyl halides, the halogen atom is attached to a carbon which attached to how many carbon atoms?
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Two
Three
One
Four
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Question # 26
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 # 27
1, 3-Dibromopropane reacts with metallic zinc to form
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Propene
Propane
Cyclopropane
Hexane
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Question # 28
Allyl chloride on dehydrochlorination gives
Choose an answer
Propadiene
Propylene
Allyl alcohol
Acetone
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Question # 29
A reaction in which an atom or a group of atoms replaces an atom or a group of atoms in the molecule of a substance is known as
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Addition reaction
Condensation reaction
Elimination reaction
Substitution reaction
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Question # 30
Ethyl bromide is formed by the reaction of HBr with
Choose an answer
Ethane
Ethene
Ethyne
Propane
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Question # 31
Tetrabromoethane on treatment with alcoholic zinc gives
Choose an answer
Ethylbromide
Ethane
Ethene
Ethyne
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