Question Set B

CBSE 12th Standard Chemistry Haloalkanes and Haloarenes HOT Questions Study Material - QB365

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Questions:

Multiple Choice Question

50 x 1 = 50

The C-O-C bond angle in the ether molecule is

(a)

111°

(b)

90°

(c)

120°

(d)

180°

Whlch of the following reagents will not convert ethyl alcohol into ethyl chloride?

(a)

PCl₅

(b)

NaCl

(c)

SOCl₂

(d)

HCl / ZnCl₂

Which of the following is the correct increasing order for the rate of reaction of the given compounds towards nucleophilic substitution?

(a)

(i) < (ii) < (iii)

(b)

(iii) < (ii) < (i)

(c)

(i) < (iii) < (ii)

(d)

(iii) < (i) < (ii)

Which of the following compounds will react with sodium hydroxide solution in water?

(a)

C₆H₅OH

(b)

C₆H₅CH₂OH

(c)

(CH₃ )₃ COH

(d)

C₂H₅OH

Salicylic acid on reaction with CH₃OH in presence of Cone. H₂SO₄gives

(a)

Methyl salicylate (Iodex)

(b)

Benzoic acid

(c)

Methyl benzoate

(d)

Phenol

Which of the following are benzylic alcohols?

(a)

C₆H₅ -CH₂ -CH₂OH

(b)

C₆H₅-CH₂OH

(c)

(d)

Which of the following reactions will yield phenol?

(a)

(b)

(c)

(d)

Monochlorination of toluene in sunlight followed by hydrolysis with aq. NaOH yields ___________

(a)

o-Cresol

(b)

m-Cresol

(c)

2, 4-Dihydroxytoluene

(d)

benzyl alcohol

\(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CONa}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl} \stackrel{-\mathrm{NaCl}}{\longrightarrow}\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COC}_{2} \mathrm{H}_{5}\) is called

(a)

Etard reaction

(b)

Gattermann Koch reaction

(c)

Williamson synthesis

(d)

Esterification

10.

THe electrophile involved in Riemer-Tiemann reaction of phenol with CHCI₃ in presence of NaOH is

(a)

:CCl ₂

(b)

\(\stackrel{\ominus}{C} C_{3}\)

(c)

\(\stackrel{\oplus}{\mathrm{CHO}} \)

(d)

\(\stackrel{\oplus}{\mathrm{C}} \mathrm{HCl}_{2}\)

11.

\(\text { Phenol } \stackrel{\mathrm{Zn} \text { , dust }}{\longrightarrow} \cdot \mathrm{X}^{\prime} \frac{\mathrm{CH}_{3} \mathrm{Cl}}{\text { Anhy. } \mathrm{AICl}_{3}} \cdot \mathrm{Y}, \frac{\text { Alkaline }}{\mathrm{KMnO}_{4}} \text { ' } \mathrm{Z} \text { ' }\)
The product 'Z' is

(a)

Benzaldehyde

(b)

Benzoic acid

(c)

Benzene

(d)

Toluene

12.

The heating of phenyl methyl ether with HI produces

(a)

Iodobenzene

(b)

Phenol

(c)

Benzene

(d)

Ethyl chloride

13.

The product 'E' is

(a)

(b)

(c)

(d)

14.

Which of the following structures is enantiomeric with the molecule (A) given below:

(a)

(b)

(c)

(d)

15.

The reaction of \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{3}\) with HBr produces

(a)

C₆H₅CH₂CH₂CH₂Br

(b)

(c)

(d)

16.

The reagent(s) used for the reduction of aldehydes and ketone into alcohols is/are

(a)

fmely divided metals such as Pt/Pd/Ni

(b)

sodium borohydride

(c)

lithium aluminium hydride

(d)

All of the above

17.

IUPAC name of the compound
is ___________.

(a)

1-methoxy-1-methylethane

(b)

2-methoxy-2-methylethane

(c)

2-methoxypropane

(d)

isoptopylmethyl ether

18.

IUPAC name of m- cresol is___________.

(a)

3-methylphenol

(b)

3-chlorophenol

(c)

3-methoxyphenol

(d)

benzene-1,3-diol

19.

Choose the incorrect statement among the following:

(a)

In polyhalogen compounds, more than one halogen atom is present

(b)

Dichloromethane is used as paint remover

(c)

Chloroform is used as an anaesthetic in surgery

(d)

Chloroform is also used as paint remover

20.

(a)

(i) < (ii) < (iii)

(b)

(i) < (iii) < (ii)

(c)

(iii) < (ii) < (i)

(d)

(ii) < (iii) < (i)

21.

(a)

(i) < (ii) < (iii)

(b)

(iii) < (ii) < (i)

(c)

(i) < (iii) < (ii)

(d)

(iii) < (i) < (ii)

22.

Which of the carbon atoms present in the molecule given below are asymmetric?

(a)

1, 2, 3, 4

(b)

2, 3

(c)

1,4

(d)

1, 2, 3

23.

Which of the following is halogen exchange reaction?

(a)

RX + NaI ⟶ RI + NaX

(b)

\(C=C+HX\to \underset{\overset{|}{H}}{C-}\underset{\overset{|}{H}}{C}\)

(c)

\(R-\mathrm{OH}+\mathrm{HX} \stackrel{\mathrm{ZnCl}_{2}}{\longrightarrow} R-X+\mathrm{H}_{2} \mathrm{O}\)

(d)

24.

Carbon-halogen bond is polarised because

(a)

halogen atom is less electronegative

(b)

halogen atom is more electronegative than carbon atom

(c)

carbon bears negative charge while halogen bears positive charge

(d)

None of the above

25.

The position of Br in the compound CH₃CH= CHC(Br)(CH₃)₂ can be classified as ___________.

(a)

allyl

(b)

aryl

(c)

vinyl

(d)

secondary

26.

Which of the following compounds will give a yellow precipitate with iodine and alkali?

(a)

Acetophenone

(b)

Methyl acetate

(c)

Acetamide

(d)

2-Hydroxypropane

27.

tert-Butyl ether on heating with HI gives a mixture of

(a)

tert-butyl alcohol and methyl iodide

(b)

tert-butyl iodide and methanol

(c)

isobutylene and methyl iodide

(d)

isobutylene and methanol

28.

Which one of the following phenols has the highest pK^a value?

(a)

o-Nitrophenol

(b)

Phenol

(c)

m-Nitrophenol

(d)

Picric acid

(e)

p-Cresol

29.

The conversion of m-nitrophenol resorcinol involves respectively

(a)

hydrolysis, diazotization and reduction

(b)

diazotisation, reduction and hydrolysis

(c)

hydrolysis, reduction and diazotization

(d)

reduction, diazotization and hydrolysis

30.

Cyclohexene is best prepared from cyclohexanol by which of the following reagents:

(a)

Conc.H₃PO₄

(b)

Conc.HCl/ZnCl₂

(c)

Conc.HCl

(d)

Conc.HBr

31.

In the reaction, CH₃COOH \(\overset{LiAlH_4}\longrightarrow\) A \(\overset{PCl_4}\longrightarrow\) B \(\overset{Alc.KOH}\longrightarrow\)C, the product C is

(a)

acetyl chloride

(b)

acetaldeyde

(c)

acetylene

(d)

ethylene

32.

Propene on hydroboration-oxidation produces

(a)

CH₃CH₂CH₂OH

(b)

CH₃CHOHCH₃

(c)

CH₃CHOHCH₂OH

(d)

CH₃CH₂CHO

33.

Consider the following reaction, ethanol \(\overset{PCl_5}\longrightarrow\) X \(\overset{alc.KOH}\longrightarrow\) Y \(\overset{H_2SO_4}{\underset {(ii)H_2O,room temperature}{\longrightarrow}}\) Z The product Z is:

(a)

CH₃CH₂- O - CH₂CH₃

(b)

CH₃CH₂- O-SO₃H

(c)

CH₃CH₂OH

(d)

CH₂= CH₂

34.

The reagents used in the preparation DDT from chlorobenzene are

(a)

Chloral (CCI₃CHO)

(b)

Conc.II₂SO₄

(c)

CH₃COCCI₃

(d)

CH₂CICOCH₂CI

35.

The reagents which cannot be used to distinguish benzyl chloride from chlorobenzene are

(a)

Br₂/CCI₄

(b)

Shaking with an aqueous solution of AgNO₃

(c)

Boiling with aqueous KOH solution followed by acidification with dil.dil. NHO₃ and addition of AgNO₃ solution.

(d)

Fusion with sodium metal followed by acidification with dil.HNO₃ and addition of AgNO₃ solution.

36.

Which of the following easily undergo nucleophilic substitution by S_N1 mechanism in butanol ?

(a)

C₆H₅CH₂Br

(b)

BrCH₂CH = CH₂

(c)

(CH₃)₃CBr

(d)

(CH₃)₃CCH₂Br

37.

How many stereoisomers does this molecule have ? CH₃CH = CHCH₂CHB₂CHBrCH₃

(a)

(b)

(c)

(d)

38.

How many chiral compounds are possible on monochlorination of 2-methylbutane ?

(a)

(b)

(c)

(d)

39.

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?

(a)

Cl^-

(b)

Cl⁺

(c)

AlCl₃

(d)

[AlCl₄]^-

40.

Which reagent will you use for the following reaction?
CH₃CH₂CH₂CH₃ \(\longrightarrow\) CH₃CH₂CH₂CH₂Cl+CH₃CH₂CHClCH₃

(a)

Cl₂/UV light

(b)

NaCl+H₂SO₄

(c)

Cl₂ gas in dark

(d)

Cl₂ gas in the presence of iron in dark

41.

Arrange the following : CH₃CH₂CH₂CI (I), CH₃CH₂CHCICH₃(II), (CH₃)₂CHCH₂CI (III) and(CH₃)₃C^__CI (IV) in order of decreasing tensency towards S_N2 reactions

(a)

I > III > II > IV

(b)

III > IV > II > I

(c)

II > I > III > IV

(d)

IV > III > II > I

42.

The synthesis of alkyl flurides is best acomplished by

(a)

Finekelstein reaction

(b)

Swarts reaction

(c)

free radical fluourination

(d)

Sandmeyer's reaction

43.

An ether is more volatile than alcohol having the same molecular formula. This is due to

(a)

intermolecular hydrogen bonding in alcohols

(b)

dipolar character of ethers

(c)

alcohols having resonance structures

(d)

intermolecular hydrigen bonding in ethers.

44.

Products obtained when HI reacts with isopropyl methyl ether at 373 K are

(a)

isopropyl iodide and methyl alcihol

(b)

isopropyl alcohol and methyl iodide

(c)

isopropyl iodide and water

(d)

methyl iodide and water

45.

The relative ease of dehydration of alcohols follows the following order :

(a)

tertiary>secondary>primary

(b)

primary>secondary>tertiary

(c)

secondary>tertiary>primary

(d)

tertiary>primary>secondary

46.

Among the following the strongest nucleophile is

(a)

C₂H₅SH

(b)

CH₃COO^-

(c)

CH₃NH₂

(d)

NCCH₂^-

47.

The reactivity order of halides for dehydrohalogenation is

(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- > R-I > R-Br > R-Cl

48.

Which of the following are arranged in the decreasing order of dipole moment?

(a)

CH₃Cl, CH₃Br, CH₃F

(b)

CH₃Cl, CH₃F, CH₃Br

(c)

CH₃Br, CH₃Cl, CH₃F

(d)

CH₃Br, CH₃F, CH₃Cl

49.

When Chlorine is passed through propene at 400^oC, which of the following is formed?

(a)

PVC

(b)

Allyl chloride

(c)

Vinyl chloride

(d)

1,2-Dichloroethane

50.

Addition of HBr gives same product in the presence or absence of peroxide when alkene is

(a)

1-butene

(b)

2-methylpropene

(c)

propene

(d)

2-butene

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(a)
111°

(b)
NaCl

(a)
C₆H₅OH

(a)
Methyl salicylate (Iodex)

(b)
C₆H₅-CH₂OH

(d)
benzyl alcohol

10.

(a)
:CCl ₂

11.

(b)
Benzoic acid

12.

(b)
Phenol

13.

14.

15.

16.

(d)
All of the above

17.

18.

(a)
3-methylphenol

19.

(d)
Chloroform is also used as paint remover

20.

(d)
(ii) < (iii) < (i)

21.

22.

(b)
2, 3

23.

(a)
RX + NaI ⟶ RI + NaX

24.

(b)
halogen atom is more electronegative than carbon atom

25.

(a)
allyl

26.

(d)
2-Hydroxypropane

27.

(b)
tert-butyl iodide and methanol

28.

(e)
p-Cresol

29.

(d)
reduction, diazotization and hydrolysis

30.

(a)
Conc.H₃PO₄

31.

(d)
ethylene

32.

(a)
CH₃CH₂CH₂OH

33.

34.

(a)
Chloral (CCI₃CHO)

35.

(d)
Fusion with sodium metal followed by acidification with dil.HNO₃ and addition of AgNO₃ solution.

36.

(a)
C₆H₅CH₂Br

37.

38.

(a)
2

39.

(b)
Cl⁺

40.

(a)
Cl₂/UV light

41.

(a)
I > III > II > IV

42.

(b)
Swarts reaction

43.

(a)
intermolecular hydrogen bonding in alcohols

44.

(b)
isopropyl alcohol and methyl iodide

45.

(a)
tertiary>secondary>primary

46.

(a)
C₂H₅SH

47.

(b)
R-I > R-Br > R-Cl > R-F

48.

(b)
CH₃Cl, CH₃F, CH₃Br

49.

(b)
Allyl chloride

50.

(d)
2-butene

CBSE 12th Standard Chemistry Haloalkanes and Haloarenes HOT Questions Study Material - QB365 Set B

QB365 Student Learing Managemnet System

Std: 12th Standard CBSE - Chemistry

chapter: Haloalkanes and Haloarenes - HOT Questions

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Questions:

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Answers Key:

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