Haloalkanes & halorenes MCQs
Multiple Choice Questions on haloalkanes & halorenes
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If you are looking for Multiple Choice Questions on haloalkanes & halorenes Here we collected some important MCQ on haloalkanes & halorenes for you. The MCQ questions on haloalkanes & halorenes included in this page have been selected based on the popular questions asked in various competitive exams over the years.
Multiple Choice Questions on haloalkanes & halorenes
1) Ethyl bromide when refluxed with silver salt of ethanoic acid it gives
a) diethyl ether
b) ethyl alcohol
c) ethyl ethanoate
d) ethanoic anhydride
Answer :b
2) Which of the following organic compound contain co-ordinate bond?
a) alkyl amine
b) acid amide
c) alkyi cyanide
d) alkyl isocyanide
Answer : d
3) An alcohol which take about 5-minutes to develope turbidity with Lucas reagent is_______
a) n-butyl alcohol
b) sec. butyl alcohol
c) iso butyl alcohol
d) tert butyl alcohol
Answer : b
4) When tert butyl alcohol is refluxed with NaBr and conc. H2SO4 it predominately gives________
a) tert. butyl bromide
b) tert. butyl hydrogen sulphate
c) 2-methyl propane
d) 2methyl propene
Answer : d
5) The best of alkyl iodide is obtained when alcohol is heated with_______
a) NaI + 95 9% H3PO4,
b) Conc. H,PO,
c) Nal+conc. H2SO4
d) none
Answer : a
6) Which of the following phosphorus halides does not exist?
a) PCl3
b) PPCL5
c) Pbr3
d) Pbr5
Answer : d
7) Alkyl is conveniently prepared from alcohol by using_______
a) phosphorus pentachloride
b) sulphonyl chloride
c) conc. hydrogen chloride
d) phosphorus trichloride
Answer : b
8) When 3-methylbutan-2-ol is heated with sodium bromide and dil. HsO4. The major product______
a)2-bromo-3-methylbutane
b) 2-methylbut-2-ene
c) 2-bromo-2-methyl butane
d) 3-methyl but-1-ene
Answer : b
9) The number ot isotones ootalned on monochlorination on of propane___
a) 2
b) 4
c) 3
d) 1
Answer : a
10) Only two isomeric monochloro derivative are possible for_______
a) 2-methyl propane
b) 2-methyl butane
c) n-hexane
d) n-heptane
Answer : a
11) The order of reactivity of different halogens with alkanes for halogenation is_____
a) f2> Cl2> Br2 >I2
b) F2>Br2>Cl2 >I2
c) F2>Cl2>I2> Br2
d) F2>I2>Br2>Cl2
Answer : a
12) Pure alkyl chloride can be obtained from alkanol by the action of,
a) PCl5
b) PCl3
c) Cl2
d) SOCl2
Answer : d
13) In the chlorination of isobutane (2-methyl propane) the major product is,
a) CH3CH2CH2CH2CI
b) CH3CH(CH3)CH2Cl
c) CH3CH2CH(CH3)Cl
d) (CH3)3CCL
Answer :d
14) Major product obtained when 2-chloro 3-methylbutane treated wth alcoholic potash is likely to be______
a) neo- pentyi alcohol
b) pentene
c) 2methyl-2-butene
d) 2-methyl1-butene
Answer- : C
15) Consider the following compounds,
1 CH3CH2CH2Br
2 CH3CHBrCH3
3. (CH3)3 CBr
These compounds are dehydro-halogenated by treatment with strong base under identical conditions
The correct sequence of reactivity of these compound in the given reaction is,
a) 1>2>3
b) 3>1>2
c) 2>1>3
d) 3>2>1
Answer- : d
16) When ethyl alcohol (C2H5OH) reacts with thionyl chloride in the presence of pyridine, the products obtained are_________
a) CH3CH2Cl + HÇ
b) C2H5Cl + HCI + SO2
c) CH3CH2CI+ H2O + SO2
d) H3CH2Cl + Cl2 +SO2
Answer- : b
17) Grignards reagent undergo______–
a) nucleophilic substitution
b) nucleophilic addition
c)electrophilic substitution
d electrophilic addition
Answer- : b
18) The reaction of t-butyl chloride and sodium ethoxide gives mainly_______
a) tert-butyl ethyl ether
b) iso-propyl n-propyl ether
c) 2,2-dimethyl butane
d) 2-methyl-1-propene
Answer- : d
19) Consider the following haloalkanes,
1) CH3F
2) CH3Cl
3) CH3 Br
4) CH3I
The increasing order of reactivity in nucleophilic Substitution reaction is,
a) 1<2<3<4
b) 1<3<2<4
c) 1<2<4<3
d) 4<3<2<1
Answer- : a
20) Anisole is the product when chlorobenzene is treated with
a) Cuprous cyanide
b) Ammonia
c) Sodium methoxide
d) Sodium hydroxide
Answer- : C
21) Aromatic ketones can be obtained from chlorobenzene by _________
a) Friedal Crafts acetylation
b) nitration
c) Friedal- craft alkylation
d) none ot these.
Answer- : a
22) In the nitration of chlorobenzene, the major product is_________
a) o-nitrochlorobenzene
b) p-nitrochiorobenzene
c) 3-nitrochlorobenzene
d) 3,5 dinitrochlorobenzene.
Answer- : b
23) The maximum number of isomers possible with the aromatic Compound, with molecular formula C7H7X is _______
a) 3
b) 5
c) 2
d) 4
Answer- : d
24) ln chlorobenzene, the- group______
a) activates the benzene ring more by resonace effect tnan deactivating it by inductive eftect.
b) deactivative
c) activates the benzene ring by resonace and deactivates it by inductive etfect and both these effects
are balanced.
d) deactives the benzene ring by resonace and activates it by inductive effect and both these effects are balanced.
Answer- : b
25) Chlorobenzene on heating with aq. NH3 under pressure in the presence of Cu2 Cl2 gives
a) benzamide
b) aniline
c) o-aminochlorobenzene
d) dichlorobenzene
Answer- : b
26) Anisole is the product when chlorobenzene reacts with_______
a) CH3ONa
b) CH3-O-CH3
c) CH3CI
d) CH3OH
Answer- : a
27) Some statements about C-CI bond in chlorobenzene are given below
A) It acquires partial double character due to reasonace.
(B) It is longer than C-Cl bond in chloromethane
(C) It is more stable thanC-Clbond in methyl chloride
(D) lt is more reactive than C-Cl bond in chloroalkanes
Among the above
a) Only A is true
b A and C are true
c B, Cand D are false
d) All are true
Answer- : b
28) Carbanion contains…. electrons in valence shell
a) six
b) ten
c) five
d) eight
Answer- : d
29) Isopropyl chloride on hydrolysis, followed by dehydration gives
a) propene
b) ethylen
c) propane
d) propylene
Answer- : d
30) Which of the following is an electrophile?
a) NH3
b) OH-
c) BeCl2
d) CN-
Answer- : b