Chemistry : Important Questions For CBSE Class XII ( Haloalkanes and Haloarenes) : Part - 2

(Q.51) 1,2-dichloroethane is known to exhibit. ( 1 mark )
(a) Optical isomerism
(b) Geometrical isomerism
(c) Metamerism
(d) Tautomerism

(Q.52) 2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is ( 1 mark )
(a) 2-Ethoxypentane
(b) Pentene-1
(c) cis-Pentene-2
(d) trans-Pentene-2

(Q.53) The reactivity order of halides for dehydrohalogenation is ( 1 mark )
(a) R – F > R – Cl > R – Br > R – I
(b) R – I > R – Br > R – Cl > R – F
(c) R – I > R – Cl > R – Br > R – F
(d) R – F > R – I > R – Br > R – Cl

(Q.54) Which of the following is correct ? ( 1 mark )
(a) A and B are same and C is different
(b) A and C are same and B is different
(c) A, B and C are same
(d) B and C are same and A is different

(Q.55) In reaction, recemization takes place. It is due to ( 1 mark )
(a) inversion of configuration
(b) retention of configuration
(c) conversion of configuration
(d) both (a) & (b)

(Q.56) Identify Z in ( 1 mark )
(a) Mixture of CH3CHClCH2Cl and CH3CHOHCH2Cl
(b) CH3CHOHCH2Cl
(c) CH3CHClCH2OH
(d) CH3CHClCH2Cl

(Q.57) The reaction of with CuCl gives ( 1 mark )
(a)
(b)
(c)
(d)

(Q.58) Which of the following will give ethanal with aqueous KOH: ( 1 mark )
(a) Chloroacetic acid
(b) 1,2-Dichloroethane
(c) 1,1-dichloroethane
(d) ethyl chloride

(Q.59) Chlorobenzene on heating with NH3under pressure in the presence of cuprous chloride gives ( 1 mark )
(a) Benzamide
(b) Nitrobenzene
(c) Aniline
(d) o- and p-Chloroaminobenzene

(Q.60) A new carbon-carbon bond formation is possible in: ( 1 mark )
(a) Cannizzaro reaction
(b) Friedel Craft reaction
(c) Clemmensen reduction
(d) Wurtz reaction

(Q.61) Benzenehexachloride is used as: ( 1 mark )
(a) dye
(b) antimalarial drug
(c) antibiotic
(d) insecticide

(Q.62) In the reaction of p-chlorotoluene with KNH2 in liquid NH3, the major product is: ( 1 mark )
(a) o- toluidine
(b) m-toluidine
(c) p-toluidine
(d) p-chloroaniline

(Q.63) Chloroform is slowly oxidized by air in presence of light to form: ( 1 mark )
(a) Formyl chloride
(b) Phosgene
(c) Trichloroacetic acid
(d) Formic acid

(Q.64) Butane nitrile may be prepared by heating: ( 1 mark )
(a) Propyl alcohol with KCN
(b) Butyl alcohol with KCN
(c) Butyl chloride with KCN
(d) Propyl chloride with KCN

(Q.65) Benzylchloiride can be prepared from toluene by chlorination with: ( 1 mark )
(a) SO2Cl2
(b) SOCl2
(c) Cl2
(d) NaOCl

(Q.66) The reaction of toluene with Cl2 in the presence of FeCl3 gives predominantly. ( 1 mark )
(a) Benzoyl chloride
(b) m-chlorotoluene
(c) Benzyl chloride
(d) o- and p-chlorotoluene

(Q.67) When 1-chloropropane is treated with alc. KOH, it forms an alkene. The reaction is: ( 1 mark )
(a) Substitution reaction
(b) Elimination reaction
(c) Addition reaction
(d) Dehydration reaction

(Q.68) The possible number of enantiomeric pairs that can be produced during monochlorination of 2- methyl butane is: ( 1 mark )
(a) 2
(b) 3
(c) 4
(d) 1

(Q.69) Freon-12 is commonly used as: ( 1 mark )
(a) Insecticide
(b) Refrigerant
(c) Solvent
(d) Fire extinguisher

(Q.70) The trade name of trichloroethylene is: ( 1 mark )
(a) Westrosol
(b) Freon
(c) Westron
(d) D.D.T.

(Q.71) The C-H bond distance is longest in: ( 1 mark )
(a) C2H2
(b) C2H4
(c) C2H6
(d) C2H2Br2

(Q.72) The above structural formula refers to ( 1 mark )

(b) DNA
(c) DDT
(d) RNA

(Q.73) Which of the following alkyl halides is used as a methylating agent? ( 1 mark )
(a) C2H5Br
(b) C6H5Cl
(c) CH3I
(d) C2H5Cl

(Q.74) obtained by chlorination of n-butane, will be ( 1 mark )
(a) meso-form
(b) racemic mixture
(c) d-form
(d) I-form

(Q.75) Hydrocarbon A reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. A is: ( 1 mark )
(a) CH2=CH2
(b) HC C
(c) CH4
(d) CH3-CH3

(Q.76) Which of the following will have the maximum dipole moment? ( 1 mark )
(a)
(b)
(c)
(d)

(Q.77) alc.KOH In the reaction CH3HC2I ______________? X ________? Y ________? Z, Z is: ( 1 mark )
(a) CH3CH2CN
(b) CNCH2CH2CN
(c) BrCH2CH2CN
(d) BrCH=CHCN

(Q.78) The order of reactivity of alkyl halides towards elimination reaction is ( 1 mark )
(a) 3° > 2° > 1°
(b) 2° > 1° > 3°
(c) 3° > 1° > 2°
(d) 1° > 2° > 3°

(Q.79) When primary amine reacts with chloroform in ethanolic KOH, then the product is ( 1 mark )
(a) an isocyanide
(b) an aldehyde
(c) a cyanide
(d) an alcohol

(Q.81) Freon-12 is commonly used as ( 1 mark )
(a) Insecticide
(b) Refrigerant
(c) A solvent
(d) A fire extinguisher

(Q.82) mechanism proceeds through intervention of ( 1 mark )
(a) Carbonium ion
(b) Transition state
(c) Free radical
(d) Carbanion

(Q.83) Match list I (compound) with list II (use) and select the correct answer using the codes given below the lists : ( 1 mark )

List I
I. Acetylsalicylic acid
II. DDT
III. Naphthalene
IV. Carbon tetra-chloride

List II
A. Insecticide
B. Drug
C. Moth repellent
D. Fire extinguisher
E. Refrigerant

(a) I-B, II-A, III-C, IV-D
(b) I-E, II-C, III-D, IV-A
(c) I-B, II-C, III-D, IV-A
(d) I-E, II-A, III-C, IV-D

(Q.84) Which of the following will give vinyl chloride ? ( 1 mark )
(a)
(b)
(c)
(d) All

(Q.85) Identify the set of reagent/reaction conditions 'X' and 'Y' in the following set of transformations:( 1 mark )
(a) X = dilute aqueous NaOH, 20°C; Y = HBr / acetic acid, 20°C
(b) X = concentrated alcoholic NaOH, 80°C; Y = HBr / acetic acid, 20°C
(c) X = dilute aqueous NaOH, 20°C; Y = Br2/ CHCl3, 0°C
(d) X = concentrated alcoholic NaOH, 80°C; Y = Br2/ CHCl3, 0°C

(Q.86) The reaction of benzyl chloride with sodium cyanide followed by reduction with hydrogen in the presence of nickel gives ( 1 mark )
(a) -Phenylethylamine
(b) N-Isobutylaniline
(c) Benzylamine
(d) Aniline

(Q.87) When chlorine is passed through propene at 400°C, which of the following is formed? ( 1 mark )
(a) PVC
(b) Allyl chloride
(c) Vinyl chloride
(d) 1,2-Dichloroethane

(Q.88) SN2 mechanism proceeds through the intervention of: ( 1 mark )
(a) Carbonium ion
(b) Transition state
(c) Free radical
(d) Carbanion

(Q.89) Chloroform on treatment with alc.KOH and aniline gives: ( 1 mark )
(a) Phenyl isocyanide
(b) Phenol
(c) Cyanobenzene
(d) None of these

(Q.90) The product of reaction of alcoholic silver nitrate with ethyl bromide is: ( 1 mark )
(a) Ethylene
(b) Ethyl nitrite
(c) Nitro ethane
(d) Ethyl alcohol

(Q.91) In the reaction CH3CHCl2 intermediate X, X is ( 1 mark )
(a) CH3CHO
(b) (CH3)2CO
(c) CH3CH2OH
(d) HO-CH2CH2OH

(Q.92) Which of the following will have zero dipole moment? ( 1 mark )
(a) 1,1-Dichloroethylene
(b) cis-1,2-Dichloroethylene
(c) trans-1,2-Dichloroethylene
(d) none of these

(Q.93) Only two isomeric monochloro derivatives are possible for: ( 1 mark )
(a) n-hexane
(b) 2,4-Dimethylpentane
(c) benzene
(d) 2-methylpropane

(Q.94) Alkyl halide on treatment with alc. KOH gives: ( 1 mark )
(a) Alcohols
(b) Alkenes
(c) Alkanes
(d) Aldehydes

(Q.95) Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives: ( 1 mark )
(a) o-cresol
(b) p-cresol
(c) 2,4-Dihydroxytoluene
(d) Benzoic acid

(Q.96) Which of the following can not be used in friedel-crafts reaction: ( 1 mark )
(a) FeCl3
(b) FeBr3
(c) AlCl3
(d) NaCl

(Q.97) The fire extinguisher with brand name Pyrene is chemically ( 1 mark )
(a) Dichloromethane.
(b) Trichloromethane.
(c) Tetrachloromethane.
(d) Geminal dichloride.

(Q.98) Reimer-Tiemann reaction involving chloroform produces ( 1 mark )
(a) Salicylic acid.
(b) Benzoic acid.
(c) Salicyladehyde.
(d) Benzaldehyde.

(Q.99) Primary and secondary chloroalkanes are prepared by passing HCl gas through a suitable alcohol in the presence of anhydrous zinc chloride. This reaction is known as ( 1 mark )
(a) Swarts reaction.
(b) Finkelstein reaction.
(c) Borodine reaction.
(d) Grove reaction.

(Q.100) Breathing about 900 ppm of chloroform for a short time can cause dizziness, fatigue and headache. The part of body that metabolizes chloroform to phosgene is ( 1 mark )
(a) Kidneys.
(b) Gall bladder.
(c) Pancreas.
(d) Liver.

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