Worksheetshaloalkane haloarenes
Total questions: 25
Worksheet time: 24mins
Ambident nucleophile is
CN
H2O
Cl
NH2
Among dihaloarenes, the melting point is highest for
o-Isomer
p-Isomer
m-Isomer
Same for all
The reactivity of halides in SN2 reaction is
3o>2o>1o
2o>1o>3o
1o>3o>2o
1o>2o>3o
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
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
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
The position of –Br in the compound in CH3CH=CHC(Br)(CH3)2 can be classified as ____________.
Allyl
Aryl
Vinyl
Secondary
Alkaline hydrolysis of (CH3)3CBr involves two steps as follows.
(CH3)3CBr → (CH3)3C+ + Br- slow
(CH3)3C+ + OH- → (CH3)3COH fast
Which of the following shows the rate equation for the reaction scheme?
Rate = k[OH-]
Rate = k[(CH3)3CBr]
Rate = k[(CH3)3CBr]2
Rate = k[(CH3)3CBr][OH-]
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
Chlorobenzene is formed by reaction of chlorine with benzene in the presence of AlCl3. Which of the following species attacks the benzene ring in this reaction?
Cl-
Cl+
AlCl3
[AlCl4]-
Which of the following reactions can be used to fluorinate a compound?
Sandmeyer’s reaction
Darzen’s reaction
Hunsdicker reaction
Swartz reaction
Ethylidene chloride is a/an ______________.
vic-dihalide
gem-dihalide
allylic halide
vinylic halide
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
In SN1 type of mechanism the intermediate species is:
A free radical
A carbonium ion(carbo cation)
A carboanion
None of these
Ethyl bromide on treatment with silver cyanide give :
Ethyl acetate
Ethyl iso cyanide
Ethyl cyanide
Ethyl amine
SN2 reaction involves the formation of __________ intermediate
Carbocation
Carboanion
Transition state
None of these
Ethylmagnesium chloride is an example of Grignard reagent. It may be used to prepare
ethene
ethanol
1-propanol
ethanoic acid
SN1 stand for
Unimolecular nucleophilic substitution
Bimolecular nucleophilic substitution
What type of reaction is shown
Addition
Elimination
Substitution
Replacement
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
Arrange the above compounds in the increasing order of their densities
(a) < (b) < (c) < (d)
(a) < (c) < (d) < (b)
(d) < (c) < (b) < (a)
(b) < (d) < (c) < (a)
Give the observation.
The reddish-brown colour of bromine remain unchanged.
The reddish-brown colour of bromine decolourised
Brown precipitate formed.
The purple colour of bromine decolourised.
