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Online Tests
ECAT Chemistry Chapter 21 Alkyl Halides Online Test MCQs With Answers
Question # 1
The reactivity order of alkyl halides for a particular alkyl group is:
Choose an answer
F >Cl>Br>I
Cl>Br>F>l
l>Br>Cl>F
Br>l>Cl>F
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Question # 2
The reaction of an alkyl halide with RCOOAg produces
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Ester
Ether
Aldehyde
Ketone
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Question # 3
Grignard's reagent on treatment with dry CO
2
and HCI yields
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Ester
Alcohol
Carboxylic acid
Aldehyde
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Question # 4
The most reactive compound for electrophilic nitration will be
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Benzyl chloride
Benzoic acid
Nitrobenzene
Chlorobenzene
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Question # 5
Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because
Choose an answer
NO
2
makes the electron rich ring at ortho and para positions
NO
2
withdraws electrons at metaposition
NO
2
donate electrons at m-position
NO
2
withdraws electrons at ortho and para position
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Question # 6
Alkyl halides react with Mg in dry ether to form
Choose an answer
Magnesium halide
Grignard's reagent
Alkene
Alkyne
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Question # 7
When carbon dioxide is passed through the R - Mg - X is produced
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Any carboxylic acid
Propanoic acid
Propanedioic acid
None of these
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Question # 8
Grignard's reagent on treatment with carbonyl compounds yield
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Pheonol
Alcohol
Alkane
None of these
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Question # 9
Dehydrohalogenation of alkyl halides give
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Alkanes
Alkenes
Alkynes
Alkdehyde
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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
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 # 12
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 # 13
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 # 14
Grignard's reagent is
Choose an answer
Alkyl halide
Magnesium halide
Alkyl magnesium halide
Ethereal solution of an alkyl halide
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Question # 15
Which of the following compounds gives trichoromethane on distilling with bleaching power?
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Methanal
Phenol
Ethanol
methanol
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Question # 16
Alkyl halides on treatment with aqueous KOH give
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Phenol
Alcohol
Aldehyde
Ketone
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Question # 17
Which of the following chlorocompounds is heat easily hydrolysed by hydorxide ion to give the product indicated
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Question # 18
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 # 19
General formula of alkyl halide is:
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R----X
R----OH
R------COH
R------COOH
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Question # 20
Which is a good nucleophile?
Choose an answer
F
-1
Cl
-1
Be
-1
I
-1
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Question # 21
The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is
Choose an answer
Iodide > bromide > chloride
Chloride > bromide > iodide
Bromide > chloride > iodide
Bromide > iodide > chloride
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Question # 22
Which of the following compounds could be prepared by reacting bromoethane with KCN and then reducing the product
Choose an answer
CH
3
CH
3
CH
3
CH
2
NH
2
CH
3
CH
2
CH
2
NH
2
CH
3
CH
2
CH
3
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Question # 23
Alkanes may be prepared by the reaction of alkyl halides with
Choose an answer
Alcohol
Carboxylic acid
Grignard reagents
None of these
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Question # 24
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 # 25
Choose an answer
Electronphilic substitution
Electrophilic addition
Free radical substitution
Nuclephilic substitution
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Question # 26
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 # 27
For the carbylamine reaction we need hot alc.KOH and
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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 # 28
which one of the following is not a nucleophile?
Choose an answer
H
2
O
H
2
S
BF
3
NH
3
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Question # 29
If ketone reacts with Grignard's reagent, it also produces alcohol, But it will be a
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primary alcohol
Secondary alcohol
Tertiary alcohol
Aromatic alcohol
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Question # 30
Which bond is most stable
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C - Cl
C - F
C - Br
C - I
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Question # 31
What is the total number of different chloroethanes of formula C
2
H
6-n
Cl
n
possible (n may be 1 to 6)
Choose an answer
6
8
9
10
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