Haloalkanes and Haloarenes Class 12 MCQ Based Test
Question 1. Good conductor of electricity and heat is
(a) Anthracite coke
(b) Diamond
(c) Graphite
(d) Charcoal
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Answer: (c) Graphite
Question 2. In which of the following allotropes of carbon, percentage of carbon is maximum?
(a) Wood charcoal
(b) Coconut charcoal
(c) Graphite
(d) None of these
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Answer: (c) Graphite
Question 3. The hybridisation of carbon in diamond is
(a) sp3
(b) sp2
(c) sp
(d) dsp2
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Answer: (a) sp3
Question 4. Organic compound must contain an element
(a) oxygen
(b) carbon
(c) hydrogen
(d) nitrogen
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Answer: (b) carbon
Question 5.
Alkene gives which of the following reactions?
(a) Addition reaction
(b) Substitution reaction
(c) Both (a) and (b)
(d) None of these
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Answer: (c) Both (a) and (b)
Question 6.
Single bond length between carbon-carbon is
(a) 1.34 Å
(b) 1.20 Å
(c) 1.54 Å
(d) none of these
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Answer: (c) 1.54 Å
Question 7.
Valency of carbon is
(a) 1
(b) 2
(c) 3
(d) 4
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Answer: (d) 4
Question 8.
Criteria for purity of organic solid is
(a) boiling point
(b) melting point
(c) specific gravity
(d) none of these
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Answer: (b) melting point
Question 9.
General formula of Alkene is
(a) CnH2n
(b) CnH2n+2
(c) CnH2n-2
(d) none of these
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Answer: (a) CnH2n
Question 10.
Hybridisation of carbon in ethane is
(a) sp3
(b) sp2
(c) sp
(d) sp3d2
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Answer: (a) sp3
Question 11.
Number of π bonds in ethyne is
(a) 1
(b) 2
(c) 3
(d) 4
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Answer: (b) 2
Question 12.
The compound having general formula CnH2n+2 is
(a) Alkene
(b) Alkyne
(c) Alkane
(d) none of these
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Answer: (c) Alkane
Question 13.
Which of the following is not correctly matched with its IUPAC name?
(a) CHF2CBrClF : 1-Bromo-1-chIoro-1, 2, 2-trifluoroethane
(b) (CCl3)3CCl : 2-(Trichloromethyl)-1, 1, 2, 3, 3-heptachloropropane
(c) CH3C (p-ClC6H4)2CH(Br)CH3 : 2-Bromo-3, 3-bis (4- chlorophenyl) butane
(d) o-BrC6H4CH (CH3) CH2CH3 : 2-Bromo-l- methylpropylbenzene
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Answer: (b) (CCl3)3CCl : 2-(Trichloromethyl)-1, 1, 2, 3, 3-heptachloropropane
Question 14.
The negative part of the addendum (the molecule to be added) adds on the carbon atom of the double bond containing the least number of hydrogen atoms. This rule is known as
(a) Saytzeffs rule
(b) Peroxide rule
(c) Markovnikov’s rule
(d) van’t hoff rule
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Answer: (c) Markovnikov’s rule
Question 15.
Which of the following compounds can yield only one monochlorinafed product upon free radical chlorination?
(a) 2, 2-Dimethylpropane
(b) 2-Methylpropane
(c) 2-Methylbutane
(d) n-Butane
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Answer: (a) 2, 2-Dimethylpropane
Question 16.
The reaction
is an example of
(a) nucleophilic addition
(b) free radical addition
(c) electrophilic addition
(d) electrophilic substitution
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Answer: (c) electrophilic addition
Question 17.
Halogen acids react with alcohols to form alkyl halides. The reaction follows a nucleophilic substitution mechanism. What will be the product of the following reaction?
(d) CH3CH2CH2CH2CH2Cl
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Answer: (a)
Question 18.
Bromination of methane in presence of sunlight is a
(a) nucleophilic substitution
(b) free radical substitution
(c) electrophilic substitution
(d) nucleophilic addition
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Answer: (b) free radical substitution
Question 19.
Which of the following reactions follows Markovnikov’s rule?
(a) C2H4 + HBr
(b) C3H6 + Cl6
(c) C3H6 + HBr
(d) C3H6 + Br2
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Answer: (c) C3H6 + HBr
Question 20.
The reaction of toluene with chlorine in presence of FeCl3 gives predominantly.
(a) amixture of o-and p-chlorotoluene
(b) benzyl chloride
(c) m-chlorotuluene
(d) benzoyl chloride
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Answer: (a) amixture of o-and p-chlorotoluene
Question 21.
Which of the following compounds has the highest boiling point?
(a)CH3CH2CH2Cl
(b) CH3CH2CH2CH2Cl
(c) CH3CH(CH3)CH2Cl
(d) (CH3)3CCl
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Answer: (b) CH3CH2CH2CH2Cl
Question 22.
Which of the following molecules has highest dipole moment?
(a) CH3Cl
(b) CH2Cl2
(c) CHCl5
(d) CCl4
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Answer: (a) CH3Cl
Question 23.
Arrange the following compounds in-decreasing order of their boiling points
(i) CH3Br
(ii) CH3CH2Br
(iii) CH3CH2CH2Br
(iv) CH2CH2CH2CH2Br
(a) (i) > (ii) > (iii) > (iv)
(b) (iv) > (iii) > (ii) > (i)
(c) (i) > (iii) > (ii) > (iv)
(d) (iii) > (iv) > (i) > (ii)
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Answer: (b) (iv) > (iii) > (ii) > (i)
Question 24.
X and Y in the reaction are
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Answer: (a)
Question 25.
Alkyl halides are immiscible in water though they are polar because
(a) they react with water to give alcohols
(b) they cannot form hydrogen bonds with water
(c) C -X bond cannot be broken easily
(d) they are stable compounds and are not reactive
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Answer: (b) they cannot form hydrogen bonds with water
Question 26.
Which one of the following is not correct order of boiling .points of the alkyl/aryl halides?
(a) CHCl3 > CH2Cl2
(b) CH3(CH2)3CI > CH3(CH2)2Cl
(c) (CH3)3CCl > (CH3)2CHCH2Cl
(d) CH3(CH2)3Cl > CH3CH2CHClCH3
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Answer: (c) (CH3)3CCl > (CH3)2CHCH2Cl
Question 27.
Which of the following compounds will have highest melting point?
(a) Chlorobenzene
(b) o-Dichlorobenzene
(c) m-Dichlorobenzene
(d) p-Dichlorobenzene
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Answer: (d) p-Dichlorobenzene
Question 28.
Ethyl alcohol is obtained when ethyl chloride is boiled with
(a) alcoholic KOH
(b) aqueous KOH
(c) water
(d) aqueous KMnO4
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Answer: (b) aqueous KOH
Question 29.
Which of the following alkyl halides undergoes hydrolysis with aqueous KOH at the fastest rate?
(a) CH3CH2CH2Cl
(b) CH3CH2Cl
(C) CH3CH2CH2CH2Cl
(d) CH3CH2CH (Br) CH3
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Answer: (d) CH3CH2CH (Br) CH3
Question 30.
Butane nitrile can be prepard by heating.
(a) propyl alcohol with KCN
(b) butyl chloride with KCN
(c) butyl alcohol with KCN
(d) propyl chloride with KCN
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Answer: (d) propyl chloride with KCN
Question 31.
Which of the following reactions will give the major and minor products?
(a) (a) is major product and (b) is minor product
(b) (a) is minor product and (b) is major product
(c) Both (a) and (b) are major products
(d) Only (b) is formed and (a) is not formed
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Answer: (a) (a) is major product and (b) is minor product
Question 32.
The final product in the reaction is
(a) CH3OH
(b) HCOOH
(c) CH3OH
(d) CH3COOH
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Answer: (d) CH3COOH
Question 33.
The end product (Q) is in the following sequence of reaction
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Answer: (c)
Question 34.
Methyl bromide reacts with AgF to give methyl fluoride and silver bromide. This reaction is called
(a) Fittig reaction
(b) Swarts reaction
(c) Wurtz reaction
(d) Finkelstein reaction
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Answer: (b) Swarts reaction
Question 35.
The alkyl halide is converted into an alcohol by
(a) elimination
(b) dehydrohalogenation
(c) addition
(d) substitution
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Answer: (d) substitution
Question 36.
A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH gives
(a) prop-1-ene
(b) prop-2-ene
(c) a mixture of prop-1 -ene and prop-2-ene
(d) propanol
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Answer: (a) prop-1-ene
Question 37.
An alkyl halide, RX reacts with KCN to given propane nitrile, RX is
(a) C3H7Br
(b) C4H9Br
(c) C2H5Br
(d) C5H11Br
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Answer: (c) C2H5Br
Question 38.
In SN2 reactions with the sequence of bond breaking and bond formation is as follows
(a) bond breaking is followed by formation
(b) bond formation is followed by breaking
(c) bond breaking and formation are simultaneously
(d) bond breaking and formation take place randomly
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Answer: (c) bond breaking and formation are simultaneously
Question 39.
Grignard reagents are formed by the reaction of alkyl halides by warming
(a) with alcoholic solution
(b) with MgCl2
(c) Mg in presence of dry ether
(d) with MgCO3
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Answer: (c) Mg in presence of dry ether
Question 40.
Which of the following is the most reactive towards nucleophilic substitution reaction?
(a) ClCH2– CH = CH2
(b) CH2 = CH-Cl
(c) CH3CH = CH-Cl
(d) C6H6Cl
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Answer: (a) ClCH2-CH = CH2
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