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ECAT Chemistry Chapter 21 Alkyl Halides Online Test MCQs With Answers
Question # 1
The alkyl halide is converted into an alcohol by
Choose an answer
Addition
Substitution
Dehydrohalogenation
Elimination
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Question # 2
2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is
Choose an answer
2-Ethoxypentane
Pent-1-ene
cis-Pent-2-ene
trans-Pent-2-ene
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Question # 3
Catalyst in the reaction ROH + SOCl
2
-------> RCL+SO
2
+HCl is:
Choose an answer
ZnCl
2
Pyridine
H
2
SO
4
Either
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Question # 4
A set of compounds in which reactivity of halogen atom in the ascending order is
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Chlorobenzene, vinyl chloride, chloroethane
Chloroethane, chlorobenzene, vinyl chloride
Vinyl chloride,chlorobenzene chloroethane
Vinyl chloride, chloroethane,chlorobenzene
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Question # 5
Thre rate of S
N
2 reaction depends upon the
Choose an answer
Concentration of alkyl halides
Concentration of nucleophile
Concentration of alkyl halides and nucleophile
None of the above
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Question # 6
Which of the following compounds could be prepared by reacting bromoethane with KCN and then reducing the product
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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 # 7
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 # 8
What is the total number of different chloroethanes, formula C
2
H
6-n
Cl
n
, where n can be any integer from 1 to 4
Choose an answer
4
6
7
8
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Question # 9
When an alcohol reacts with SOCI
2
an alkyl halide is formed. What are two other products
Choose an answer
SO
2
and HCI
SI
2
and H
2
O
HCI and H
2
O
H
2
S and HCI
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Question # 10
DDT is formed from
Choose an answer
Benzene and Chlorobenzene
Chloral and Chlorobenzene
Chloral and Benzene
Chlorobenzene and chlorine
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Question # 11
When chloroform is boiled with NaOH, it gives
Choose an answer
Formic acid
Trihydroxymethane
Acetylene
Sodium formate
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Question # 12
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 # 13
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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Question # 14
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 # 15
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 # 16
Alkyl halides on treatment with metallic Na give
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Alkynes
Alkenes
Alkanes
Alcohols
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Question # 17
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 # 18
Among the following the most reactive towards alcoholic KOH is
Choose an answer
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 # 19
The most reactive compound for electrophilic nitration will be
Choose an answer
Benzyl chloride
Benzoic acid
Nitrobenzene
Chlorobenzene
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Question # 20
Reduction of alkyl halides give
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Alkanes
Alkenes
Ketones
Ether
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Question # 21
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 # 22
Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent
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A ketone
An aldehyde
An ether
Water
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Question # 23
Steps in SN , reactions are:
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One
Two
Three
Four
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Question # 24
Grignard 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 them
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Question # 25
Choose an answer
Primary alkyl halide
Secondary alkyl halide
Tertiary alkyl halide
None of these
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Question # 26
Halogens on treating with silver salts of acids give
Choose an answer
Alcohol
Ester
Phenol
Alkyl halide
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Question # 27
When primary amine reacts with chloroform in ethanolic KOH, then the product is
Choose an answer
An isocyanide
An aldehyde
A cyanide
An alcohol
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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
Metal used in the preparation of Grignard's reagent is:
Choose an answer
Ca
Na
Mg
Zn
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Question # 30
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 # 31
Which bond is most stable
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C - Cl
C - F
C - Br
C - I
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