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Haloalkanes And Haloarenes
Quiz 2
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Q.1
Is haloalkane polar or non polar?
polar molecules
non polar molecules
Q.2
Which of the following is an example of vic-dihalide?
Dichloromethane
1,2-dichloroethane
Ethylidene chloride
Allyl chloride
Q.3
Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is
Electrophilic elimination reaction
Electrophilic substitution reaction
Free radical addition reaction
Nucleophilic substitution reaction
Q.4
The position of –Br in the compound in CH3CH=CHC(Br)(CH3)2 can be classified as ____________.
Allyl
Aryl
Vinyl
Secondary
Q.5
The synthesis of alkyl fluoride is best accomplished by:
Finkelstein reaction
Swarts reaction
Free radical fluorination
Sandmeyer’s reaction
Q.6
Assertion: Halogen acids react with alcohols to form haloalkanes.Reason: Order of reactivity of halogen acids HCl>HBr>HI
Both assertion and reason are true and the reason is the correct explanation of the assertion.
Both assertion and reason are true but reason is not the correct explanation of the assertion.
Assertion is true but reason is false.
Assertion is false but reason is true.
Q.7
Assertion (A): It is difficult to replace chlorine by -OH in chlorobenzene in comparison to that in chloroethane.Reason (R): Chlorine-carbon (C – Cl) bond in chlorobenzene has a partial double bond character due to resonance.
Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
Assertion is correct but Reason is wrong.
Assertion is wrong but Reason is correct.
Q.8
Assertion (A): Hydrolysis of (-)-2-bromooctane proceeds with inversion of configuration.Reason (R): This reaction proceeds through the formation of a carbocation.
Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
Assertion is correct but Reason is wrong.
Assertion is wrong but Reason is correct.
Q.9
Ambident nucleophile is
CN
H2O
Cl
NH2
Q.10
Among dihaloarenes, the melting point is highest for
o-Isomer
p-Isomer
m-Isomer
Same for all
Q.11
The reactivity of halides in SN2 reaction is
3o>2o>1o
2o>1o>3o
1o>3o>2o
1o>2o>3o
Q.12
Haloalkane is a polar molecule that undergoes nucleophilic substitution through SN1 and SNArrange the following haloalkanes in order of increasing rate of unimolecular nucleophilic substitution reaction:I. 2-chloro-2-methylpropaneII. 2-chlorobutaneIII. 1-chlorobutane
I< II < III
I< III < II
III< I < II
III< II < I
Q.13
Compound C easily undergoes hydrolysis to form compound D, which forms 2-methylpropene when heated with concentrated sulphuric acid. Using the information above, proposed the structural formula for compound C
CH3CH2CH(Br)CH3
CH3CH2CH2CH(Br)CH3
CH3CH2(CH3)CH2Br
(CH3)2C(Br)CH3
Q.14
Which of the following compounds is the rate of alkaline hydrolysis that is independent of the concentration of the hydroxide ion?
CH3CH2CH2CH2Cl
CH3CH(Br)CH3
C6H5CH2CH2I
(CH3)3CBr
Q.15
Arrange compound below according to decreasing boiling point;Pentane, 2-chloropropane, 1-butanol, 2-methylbutane
2-chloropropane, 1-butanol, 2-methylbutane, Pentane
1-butanol, 2-chloropropane, Pentane, 2-methylbutane
2-chloropropane, 2-methylbutane, Pentane, 1-butanol
2-methylbutane, Pentane, 2-chloropropane, 1-butanol
Q.16
Why does the reaction C2H+ OH- → C2H5OH + X- occur faster if X is iodine instead of Bromine?
the I- ion is a stronger nucleophile than the Br- ion.
the I- ion is less hydrated in water than the Br- ion
C-Br bond is more polar than the C-I bond
the C-Br bond is stronger than the C-I bond
Q.17
SN2 reaction involves the formation of __________ intermediate
Carbocation
Carboanion
Transition state
None of these
Q.18
Complete the following reaction R-X + KNO2 → A + KXA is
RNO2
RONO
RNO
RNO3
Q.19
The synthesis of alkyl fluoride is best accomplished by: (JEEC)
Finkelstein reaction
Swarts reaction
Free radical fluorination
Sandmeyer’s reaction
Q.20
The most reactive halogen in halogenations of alkanes under sunlight
F
Cl
Br
I
0 h : 0 m : 1 s
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