We have compiled the NCERT MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 12 Chemistry with Answers on a daily basis and score well in exams. Refer to the Haloalkanes and Haloarenes Class 12 MCQs Questions with Answers here along with a detailed explanation.
Haloalkanes and Haloarenes Class 12 MCQs Questions with Answers
Question 1.
The most reactive nucleophile among the following is
(a) CH3O–
(b) C6H5O–
(c) (CH3)2CHO–
(d) (CH3)3 CO–
Answer
Answer: (a) CH3O–
Question 2.
CH3CH2CHCl CH3 obtained by chlorination of n-butane, will be
(a) meso-form
(b) racemic mixture
(c) d-form
(d) 1-form
Answer
Answer: (b) racemic mixture
Question 3.
In Friedel-Crafts synthesis of toluene, reactants in addition to anhydrous AlCl3 are:
(a) C6H6 + CH4
(b) C6H6 + CH3Cl
(c) C5H5Cl + CH3Cl
(d) C6H5/sub>Cl + CH4
Answer
Answer: (b) C6H6 + CH3Cl
Question 4.
SN1 reaction of alkyl halides leads to
(a) retention of configuration
(b) racemisation
(c) inversion of configuration
(d) none of these.
Answer
Answer: (b) racemisation
Question 5.
Nucleophilieity order is correctly represented by
Answer
Answer: (c)
Question 6.
Which of the following are arranged in the decreasing order of dipole moment?
(a) CH3Cl, CH3Br, CH2F
(b) CH3Cl, CH3F, CH3Br
(c) CH3Br, CH3Cl, CH3F
(d) CH3Br, CH3F, CH3Cl
Answer
Answer: (b) CH3Cl, CH3F, CH3Br
Question 7.
Which of the following is a free radical substitution reaction?
(d) CH3CHO + HCN → CH3CH (OH) CN
Answer
Answer: (a)
Question 8.
The reactivity order of halides for dehydrogenation is
(a) RF > RCl > RBr > RI
(b) RI > RBr > RCl > RF
(c) RI > RCl > RBr > RF
(d) RF > RI > RBr > RCl
Answer
Answer: (b) RI > RBr > RCl > RF
Question 9.
The addition of HBr is easiest with
(a) CH2 = CHCl
(b) ClCH = CHCl
(c) CH3-CH = CH2
(d) (CH3)2C = CH2
Answer
Answer: (d) (CH3)2C = CH2
Question 10.
Among the following compounds, the decreasing order of reactivity towards electrophilic substitution is
(a) III > I > II > IV
(b) IV > I > II > III
(c) I > II > III > IV
(d) II > I > III > IV
Answer
Answer: (a) III > I > II > IV
Question 11.
Unpleasant smelling carbylamines are formed by heating alkali and chloroform with
(a) Any aliphatic amine
(b) Any aromatic amine
(c) Any amine
(d) Any primary amine
Answer
Answer: (d) Any primary amine
Question 12.
Which among MeX, R-CH2X, R2CHX, R3CX is most reactive towards SN2 reaction
(a) MeX
(b) RCH2X
(c) R3CHX
(d) R3CX
Answer
Answer: (a) MeX
Question 13.
Number of stereoisomers of the compound 2-chloro-4- methylhex-2-ene is /are
(a) 1
(b) 2
(c) 4
(d) 16
Answer
Answer: (c) 4
Question 14.
In chlorination of benzene, the reactive species is
(a) Cl+
(b) Cl–
(c) Cl2
(d) Cl\(_{2}^{-}\)
Answer
Answer: (a) Cl+
Question 15.
An organic compound, on treatment with Br2 in CCl4 gives bromo derivative of an alkene. The compound will be
(a) CH4-CH = CH2
(b) CH3-CH = CH-CH3
(c) HC = CH
(d) H2C = CH2
Answer
Answer: (c) HC = CH
Question 16.
If one H is replaced by a Cl atom in C4H9Cl, the total number of structural isomers will be
(a) 4
(b) 5
(c) 7
(d) 10
Answer
Answer: (d) 10
Question 17.
Anti-Markovnikov addition of HBr is not observed in
(a) Propene
(b) 1-Butene
(c) But-2-ene
(d) Pent-2-ene
Answer
Answer: (c) But-2-ene
Question 18.
Among the following, the molecule with the highest dipole moment is
(a) CH3Cl
(b) CH2Cl2
(c) CHCl3
(d) CCl4
Answer
Answer: (a) CH3Cl
Question 19.
The number of isomers for the compound with molecular formula C2 Br Cl FI is
(a) 3
(b) 4
(c) 5
(d) 6
Answer
Answer: (d) 6
Question 20.
(CH3)3 C MgBr on reaction with D2O produces
(a) (CH3)3CD
(b) (CH3)3COD
(c) (CH3)3CD
(d) (CD3)3OD
Answer
Answer: (a) (CH3)3CD
Question 21.
A solution (+) -2-chloro-2-phenylethane in toluene racemises slowly in the presence of small amount of SbCl5, due to the formation of
(a) Carbanion
(b) Carbene
(c) Free radical
(d) Carbocation
Answer
Answer: (d) Carbocation
Question 22.
In the addition of HBr to propene in the absence of peroxides, the fist step involves the addition of
(a) H+
(b) Br–
(c) H°
(d) Br°
Answer
Answer: (a) H+
Question 23.
In the reaction of p-Chlorotoluene with KNH2 in liq. NHy the major product is
(a) o-toluidine
(b) m-toluidine
(c) p-toluidine
(d) p-chloro aniline
Answer
Answer: (b) m-toluidine
Question 24.
During debromination of meso-dibromo butane, the major compound formed is
(a) n-butane
(b) 1-butene
(c) cis-2-butene
(d) trans-2-butene.
Answer
Answer: (d) trans-2-butene.
Question 25.
The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methyl butane is
(a) 2
(b) 3
(c) 4
(d) 1
Answer
Answer: (a) 2
Question 26.
Arrange the following compounds in order of increasing dipole moment: Toluene (I), m-dichlorobenzene (II), o- dichlorobenzene (III) and p-dichlorobenzene (IV).
(a) I < IV < II < III
(b) IV < r < II < III
(c) IV < I < III < II
(d) IV < II < I < III
Answer
Answer: (b) IV < r < II < III
Question 27.
In the following groups : – O Ac (I), – O Me (II), – O SO2 Me (III), – OSO2 CF3 (IV), The order of leaving group ability is
(a) I > II > III > IV
(b) IV > III > I > II
(c) m > II > I > IV
(d) II > III > IV > I
Answer
Answer: (b) IV > III > I > II
Question 28.
Identify the set of reagent/reaction conditions X and Y in the following set of transformations:
(a) X = dil. aqueous NaOH, 20° C, Y = HBr/Acetic acid, 20°C
(b) X = Cone, alcoholic NaOH, 80°C, Y = HBr/acetic acid, 20°C
(c) X = dil. aqueous NaOH, 20°C Y – Br2/CHCl3,0°C
(d) X = Cone, alcoholic NaOH, 80°C, Y = Br2/CHCl3, 0°C.
Answer
Answer: (b) X = Cone, alcoholic NaOH, 80°C, Y = HBr/acetic acid, 20°C
Question 29.
In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti-Markovnikov’s addition to alkenes because
(a) both are highly ionic
(b) one is oxidizing and the other is reducing
(c) one of the steps is endothermic in both the cases
(d) all the steps are exothermic in both the reactions
Answer
Answer: (c) one of the steps is endothermic in both the cases
Question 30.
When chlorine is passed through propene at 400°C, which of the following is formed?
(a) FVC
(b) Allyl Chloride
(c) Vinyl Chloride
(d) 1,2-Dichloroethane
Answer
Answer: (b) Allyl Chloride
Hope the information shed above regarding NCERT MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 12 Chemistry Haloalkanes and Haloarenes MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible.