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Chemistry 12th

Total questions: 85

Worksheet time: 43mins

Name
Class
Date
1.

Which is 2-chloro-3-ethylpentane?

a)
b)
c)
d)
2.

Which is 3-chloro-2,2-dimethylbutane?

a)
b)
c)
d)
3.

Which is 2-bromo-1-chloro-2-methylpropane?

a)
b)
c)
d)
4.

Which is 1,3-dichloro-2-methylpropane?

a)
b)
c)
d)
5.

Which is 1-chloro-3-methylbutane?

a)
b)
c)
d)
6.

Which is 1-chloro-3-ethylhexane?

a)
b)
c)
d)
7.

Which is 1-bromo-4-chloro-3-methylpentane?

a)
b)
c)
d)
8.

Which is 2-bromo-3-chlorobutane?

a)
b)
c)
d)
9.

Which is 1,2,3-trifluoropropane?

a)
b)
c)
d)
10.

Which is 1,3-dibromo-3-chlorobutane?

a)
b)
c)
d)
11.

Is haloalkane polar or non polar?

a)

polar molecules

b)

non polar molecules

12.

Choose the correct IUPAC name for the compound

a)

2-chloro-2-methylpropane

b)

1-chloropropane

c)

2-chloro-2-methylbutane

d)

2-chlorobutane

13.
Name this structure.
a)
1,2,4-dimethylcyclopentane
b)
1,2,4-trimethylcyclopentane
c)
1,3,4-trimethylcyclopentane
d)
1,3,4-dimethylcyclopentane
14.
Name this structure.
a)
1,1,2-trimethylcyclopropane
b)
1,2,2-trichlorocyclopropane
c)
1,1,2-trichlorocyclobutane
d)
1,1,2-trichlorocyclopropane
15.
Name this structure.
a)
3-chloropropane
b)
3-chloropentane
c)
Chloropentane
d)
Chloropropane
16.
Name this structure.
a)
1,3-dibromo-2-chlorobutane
b)
2,4-dibromo-3-chlorobutane
c)
1,3-bromo-2-chlorobutane
d)
2,4-bromo-3-chlorobutane
17.

1. Which alkyl halide has the highest reactivity for a particular alkyl group?

a)

R-F

b)

R-Cl

c)

R-I

d)

R-Br

18.

Write the order of increasing S1N reactivity for the following alkyl halides:

A) CH3-X

B) (CH3)2CH-X

C) (CH3)3C-X

D) (CH3)3C-CH2-X

a)

a) A>C>B>D

b)

b) C>A>B>D

c)

c) C>B>D>A

d)

d) D>C>B>A

19.

3. Which of the following is not the method of preparation of alkyl halide?

a)

a) Darzen’s method

b)

b) Halogenation of alkene

c)

c) Addition of HX on alkenes

d)

d) Hydration of alkene

20.

Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is

a)

Electrophilic elimination reaction

b)

Electrophilic substitution reaction

c)

Free radical addition reaction

d)

Nucleophilic substitution reaction

21.

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]-

22.

Which of the following reactions can be used to fluorinate a compound?

a)

Sandmeyer’s reaction

b)

Darzen’s reaction

c)

Hunsdicker reaction

d)

Swartz reaction

23.

If a substrate undergoing S2N reaction was of one stereoisomer, what would the product be like?

a)

.A racemic mixture

b)

One stereoisomer

c)

An unequal mixture of enantiomers

d)

A non-chiral compound

24.

Ethylidene chloride is a/an ______________.

a)

vic-dihalide

b)

gem-dihalide

c)

allylic halide

d)

vinylic halide

25.

. Which is the correct increasing order of boiling points of the following compounds?

a)

Bromobenzene < 1-Bromobutane < 1-Bromopropane < 1-Bromoethane

b)

Bromobenzene < 1-Bromoethane < 1-Bromopropane < 1-Bromobutane

c)

1-Bromopropane < 1-Bromobutane < 1-Bromoethane < Bromobenzene

d)

1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene

26.

Which reagent will you use for the following reaction?

CH3CH2CH2CH3 → CH3CH2CH2CH2Cl + CH3CH2CHClCH3

a)

Cl2 /UV light

b)

NaCl + H2SO4

c)

Cl2 gas in dark

d)

Cl2 gas in the presence of iron in dark

27.

Ambident nucleophile is

a)

CN

b)

H2O

c)

Cl

d)

NH2

28.

Among dihaloarenes, the melting point is highest for

a)

o-Isomer

b)

p-Isomer

c)

m-Isomer

d)

Same for all

29.

The reactivity of halides in SN2 reaction is

a)

3o>2o>1o

b)

2o>1o>3o

c)

1o>3o>2o

d)

1o>2o>3o

30.

Haloalkane is a polar molecule that undergoes nucleophilic substitution through SN1 and SN2. Arrange the following haloalkanes in order of increasing rate of unimolecular nucleophilic substitution reaction:

I. 2-chloro-2-methylpropane

II. 2-chlorobutane

III. 1-chlorobutane

a)

I< II < III

b)

I< III < II

c)

III< I < II

d)

III< II < I

31.

Which of the following is a chiral molecule?

a)

CH2BrI

b)

CH3CBr2Cl

c)

(CH3)2CHCl

d)

CH3CHBrCH2CH3

32.

Which of the following compounds is the rate of alkaline hydrolysis that is independent of the concentration of the hydroxide ion?

a)

CH3CH2CH2CH2Cl

b)

CH3CH(Br)CH3

c)

C6H5CH2CH2I

d)

(CH3)3CBr

33.

Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is

a)

Electrophilic elimination reaction

b)

Electrophilic substitution reaction

c)

Free radical addition reaction

d)

Nucleophilic substitution reaction

34.

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

a)

Allyl

b)

Aryl

c)

Vinyl

d)

Secondary

35.

Alkaline hydrolysis of (CH3)3CBr involves two steps as follows.

(CH3)3CBr → (CH3)3C+ + Br- slow

(CH3)3C+ + OH- → (CH3)3COH fast

Which of the following shows the rate equation for the reaction scheme?

a)

Rate = k[OH-]

b)

Rate = k[(CH3)3CBr]

c)

Rate = k[(CH3)3CBr]2

d)

Rate = k[(CH3)3CBr][OH-]

36.

Assertion: Halogen acids react with alcohols to form haloalkanes.

Reason: Order of reactivity of halogen acids HCl>HBr>HI

a)

Both assertion and reason are true and the reason is the correct explanation of the assertion.

b)

Both assertion and reason are true but reason is not the correct explanation of the assertion.

c)

Assertion is true but reason is false.

d)

Assertion is false but reason is true.

37.

Assertion: Electron withdrawing groups in aryl halides increases the reactivity towards nucleophilic substitution.

Reason: 2, 4-Dinitrochlorobenzene is more reactive than chlorobenzene.

a)

Both assertion and reason are true and the reason is the correct explanation of the assertion.

b)

Both assertion and reason are true but reason is not the correct explanation of the assertion

c)

Assertion is true but reason is false

d)

Assertion is false but reason is true.

38.

Assertion (A): Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.

Reason (R): Phosphorus chlorides give pure alkyl halides.

a)

Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

b)

Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.

c)

Assertion is correct but Reason is wrong.

d)

Assertion and Reason both are wrong statements

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 of the following reactions can be used to fluorinate a compound?

a)

Sandmeyer’s reaction

b)

Darzen’s reaction

c)

Hunsdicker reaction

d)

Swartz reaction

41.

Ethylidene chloride is a/an ______________.

a)

vic-dihalide

b)

gem-dihalide

c)

allylic halide

d)

vinylic halide

42.

In SN1 the order of reactivity of halide is:

a)

30 > 20 > 10 > methyl

b)

Methyl > 10>20 > 30

c)

30 > 20 > methyl > 10

d)

20 > 10 > methyl > 30

43.

In SN1 type of mechanism the intermediate species is:

a)

A free radical

b)

A carbonium ion(carbo cation)

c)

A carboanion

d)

None of these

44.

Ethyl bromide on treatment with silver cyanide give :

a)

Ethyl acetate

b)

Ethyl iso cyanide

c)

Ethyl cyanide

d)

Ethyl amine

45.

SN2 reaction involves the formation of __________ intermediate

a)

Carbocation

b)

Carboanion

c)

Transition state

d)

None of these

46.

Ethylmagnesium chloride is an example of Grignard reagent. It may be used to prepare

a)

ethene

b)

ethanol

c)

1-propanol

d)

ethanoic acid

47.

SN1 stand for

a)

Unimolecular nucleophilic substitution

b)

Bimolecular nucleophilic substitution

48.

What type of reaction is shown

a)

Addition

b)

Elimination

c)

Substitution

d)

Replacement

49.

Which is the correct increasing order of boiling points of the following compounds? 1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane

a)

Butane < 1-Chlorobutane < 1-Bromobutane < 1-Iodobutane

b)

1-Iodobutane < 1-Bromobutane < 1-Chlorobutane < Butane

c)

Butane < 1-Iodobutane < 1-Bromobutane < 1-Chlorobutane

d)

Butane < 1-Chlorobutane < 1-Iodobutane < 1-Bromobutane

50.

Arrange the above compounds in the increasing order of their densities

a)

(a) < (b) < (c) < (d)

b)

(a) < (c) < (d) < (b)

c)

(d) < (c) < (b) < (a)

d)

(b) < (d) < (c) < (a)

51.

Give the observation.

a)

The reddish-brown colour of bromine remain unchanged.

b)

The reddish-brown colour of bromine decolourised

c)

Brown precipitate formed.

d)

The purple colour of bromine decolourised.

52.

3. Which of the following is not the method of preparation of alkyl halide?

a)

a) Darzen’s method

b)

b) Halogenation of alkene

c)

c) Addition of HX on alkenes

d)

d) Hydration of alkene

53.

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]-

54.

Which of the following reactions can be used to fluorinate a compound?

a)

Sandmeyer’s reaction

b)

Darzen’s reaction

c)

Hunsdicker reaction

d)

Swartz reaction

55.

The reaction:

CH3Br + AgF → CH3F + AgBr is called

a)

Swarts reaction

b)

Finkelstein reaction

c)

Gattermann reaction

d)

Perkin reaction

56.

The synthesis of alkyl fluoride is best accomplished by: (JEE 2015 C)

a)

Finkelstein reaction

b)

Swarts reaction

c)

Free radical fluorination

d)

Sandmeyer’s reaction

57.

The geminal dihalide contains halogen bonded to

a)

Different carbon atom

b)

Same carbon atom

c)

Adjacent carbon atom

d)

All the above

58.

Complete the following reaction
R-OH + PCl5 →\rightarrow  RCl + X + HCl
X is

a)

PCl3

b)

PCl5

c)

POCl3

d)

POBr3

59.

complete the following reaction
R-OH + X →\rightarrow RCl + SO2 + HCl

a)

SO2

b)

SOCl3

c)

SOCl2

d)

SOCl

60.

The reaction:

R – Cl + KI → RI + KCl (in presence of acetone)Is known as

a)

Hunsdieker reaction

b)

Finkelstein reaction

c)

Ulmann reaction

d)

Wurtz reaction

61.

Haloalkanes are best obtained by

a)

Swartz reaction

b)

Darzzen's process

c)

Finkelstein process

d)

None of these

62.

Haloalkane is a polar molecule that undergoes nucleophilic substitution through SN1 and SN2. Arrange the following haloalkanes in order of increasing rate of unimolecular nucleophilic substitution reaction:

I. 2-chloro-2-methylpropane

II. 2-chlorobutane

III. 1-chlorobutane

a)

I< II < III

b)

I< III < II

c)

III< I < II

d)

III< II < I

63.

Which of the following compounds is the rate of alkaline hydrolysis that is independent of the concentration of the hydroxide ion?

a)

CH3CH2CH2CH2Cl

b)

CH3CH(Br)CH3

c)

C6H5CH2CH2I

d)

(CH3)3CBr

64.

Which of the following is a chiral molecule?

a)

CH2BrI

b)

CH3CBr2Cl

c)

(CH3)2CHCl

d)

CH3CHBrCH2CH3

65.

Which of the following species is/are nucleophile(s)?

I. OH–

II. H2O

III. R3C–

a)

I only

b)

I and II only

c)

II and III only

d)

I, II and III

66.

A is a secondary haloalkane with formula C5H11Br and optically active. Identify A.

a)

CH3CH2CH2CH2CH2Br

b)

CH3CH(Br)CH2CH2CH3

c)

(CH3)2C(Br)CH2CH3

d)

(CH3)2C(Br)C(CH3)2CH2CH3

67.

Name compound B below according to IUPAC nomenclature.

a)

4-chloro-5-bromo-6-phenylhexane

b)

2-bromo-3-chloro-1-phenylhexane

c)

3-bromo-1-phenyl-2-bromohexane

d)

5-bromo-4-chloro-6-phenylhexane

68.

Which is a primary alkyl halide?

a)

CH3CH(Br)CH3

b)

C6H5Cl

c)

CH3CH(CH2Br)CH3

d)

CH3CH2C(Cl)2CH3

69.

The number of isomers (including structural and stereoisomers) of C4H9Cl is

a)

2

b)

3

c)

4

d)

5

70.

Arrange compound below according to decreasing boiling point;

Pentane, 2-chloropropane, 1-butanol, 2-methylbutane

a)

2-chloropropane, 1-butanol, 2-methylbutane, Pentane

b)

1-butanol, 2-chloropropane, Pentane, 2-methylbutane

c)

2-chloropropane, 2-methylbutane, Pentane, 1-butanol

d)

2-methylbutane, Pentane, 2-chloropropane, 1-butanol

71.

SN1 stand for

a)

Unimolecular nucleophilic substitution

b)

Bimolecular nucleophilic substitution

72.

SN2 mechanism favor

a)

methyl halide

b)

3° haloalkane

73.

reactivity of haloalkanes towards SN2 mechanism

a)

3° > 2° > 1°

b)

3° < 2° < 1°

74.

Choose the correct IUPAC name for the compound

a)

2-chloro-2-methylpropane

b)

1-chloropropane

c)

2-chloro-2-methylbutane

d)

2-chlorobutane

75.

Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is

a)

Electrophilic elimination reaction

b)

Electrophilic substitution reaction

c)

Free radical addition reaction

d)

Nucleophilic substitution reaction

76.

Alkaline hydrolysis of (CH3)3CBr involves two steps as follows.

(CH3)3CBr → (CH3)3C+ + Br- slow

(CH3)3C+ + OH- → (CH3)3COH fast

Which of the following shows the rate equation for the reaction scheme?

a)

Rate = k[OH-]

b)

Rate = k[(CH3)3CBr]

c)

Rate = k[(CH3)3CBr]2

d)

Rate = k[(CH3)3CBr][OH-]

77.

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]-

78.

In SN1 type of mechanism the intermediate species is:

a)

A free radical

b)

A carbonium ion(carbo cation)

c)

A carboanion

d)

None of these

79.

Ethylmagnesium chloride is an example of Grignard reagent. It may be used to prepare

a)

ethene

b)

ethanol

c)

1-propanol

d)

ethanoic acid

80.

Which is 2-chloro-3-ethylpentane?

a)
b)
c)
d)
81.

What type of reaction is shown

a)

Addition

b)

Elimination

c)

Substitution

d)

Replacement

82.

1. Which alkyl halide has the highest reactivity for a particular alkyl group?

a)

R-F

b)

R-Cl

c)

R-I

d)

R-Br

83.

Which reagent will you use for the following reaction?

CH3CH2CH2CH3 → CH3CH2CH2CH2Cl + CH3CH2CHClCH3

a)

Cl2 /UV light

b)

NaCl + H2SO4

c)

Cl2 gas in dark

d)

Cl2 gas in the presence of iron in dark

84.
Name this structure.
a)
1,2,4-dimethylcyclopentane
b)
1,2,4-trimethylcyclopentane
c)
1,3,4-trimethylcyclopentane
d)
1,3,4-dimethylcyclopentane
85.

Which is 2-chloro-3-ethylpentane?

a)
b)
c)
d)

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