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WorksheetsCLASS XII CHEMISTRY (HALOALKANES AND HALOARENES)
Total questions: 20
Worksheet time: 10mins
1. Which alkyl halide has the highest reactivity for a particular alkyl group?
R-F
R-Cl
R-I
R-Br
Write the order of increasing S1N reactivity for the following alkyl halides:
A) CH3-X
B) (CH3)2CH-X
C) (CH3)3C-X
D) (CH3)3C-CH2-X
a) A>C>B>D
b) C>A>B>D
c) C>B>D>A
d) D>C>B>A
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
. Which is the correct increasing order of boiling points of the following compounds?
Bromobenzene < 1-Bromobutane < 1-Bromopropane < 1-Bromoethane
Bromobenzene < 1-Bromoethane < 1-Bromopropane < 1-Bromobutane
1-Bromopropane < 1-Bromobutane < 1-Bromoethane < Bromobenzene
1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene
Which reagent will you use for the following reaction?
CH3CH2CH2CH3 → CH3CH2CH2CH2Cl + CH3CH2CHClCH3
Cl2 /UV light
NaCl + H2SO4
Cl2 gas in dark
Cl2 gas in the presence of iron in dark
3. Which of the following is not the method of preparation of alkyl halide?
a) Darzen’s method
b) Halogenation of alkene
c) Addition of HX on alkenes
d) Hydration of alkene
Complete the following reaction
R-OH + PCl5 → RCl + X + HCl
X is
PCl3
PCl5
POCl3
POBr3
complete the following reaction
R-OH + X → RCl + SO2 + HCl
SO2
SOCl3
SOCl2
SOCl
When excess chlorine is used in electrophilic substitution of toluene, which of the following dichloroarenes are formed?
Ortho and meta
Ortho and para
Meta and para
Ortho, meta and para
Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?
Ethyl chloride
Isopropyl chloride
Choro benzene
Benzyl chloride
Assertion: KCN reacts with methyl chloride to give methyl isocyanide.
Reason: CN- is an ambidentate nucleophile.
A
B
C
D
In a SN1 reaction on chiral centres, there is
100% retention
100% inversion
Racemization
None
Ambident nucleophile is
CN
H2O
Cl
NH2
Haloalkane is a polar molecule that undergoes nucleophilic substitution through SN1 and SN2. Arrange the following haloalkanes in order of increasing rate of unimolecular nucleophilic substitution reaction:
I. 2-chloro-2-methylpropane
II. 2-chlorobutane
III. 1-chlorobutane
I< II < III
I< III < II
III< I < II
III< II < I
Which of the following is a chiral molecule?
CH2BrI
CH3CBr2Cl
(CH3)2CHCl
CH3CHBrCH2CH3
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.
Assertion: Electron withdrawing groups in aryl halides increases the reactivity towards nucleophilic substitution.
Reason: 2, 4-Dinitrochlorobenzene is more reactive than chlorobenzene.
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.
Assertion (A): Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.
Reason (R): Phosphorus chlorides give pure alkyl halides.
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 and Reason both are wrong statements
In SN1 the order of reactivity of halide is:
30 > 20 > 10 > methyl
Methyl > 10>20 > 30
30 > 20 > methyl > 10
20 > 10 > methyl > 30
Which is the correct increasing order of boiling points of the following compounds? 1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane
Butane < 1-Chlorobutane < 1-Bromobutane < 1-Iodobutane
1-Iodobutane < 1-Bromobutane < 1-Chlorobutane < Butane
Butane < 1-Iodobutane < 1-Bromobutane < 1-Chlorobutane
Butane < 1-Chlorobutane < 1-Iodobutane < 1-Bromobutane
