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NCERT solutions Chemistry Class 12 Part 2 chapter 10 Haloalkanes and Haloarenes

Chapters

NCERT Solutions for Chemistry Class 12 Part 1

NCERT Chemistry Class 12 Part 2

Chemistry Textbook for Class 12 Part 2

Chapter 10 - Haloalkanes and Haloarenes

Pages 285 - 307

Write structures of the following compounds:

2-Chloro-3-methylpentane

Q 1.1 | Page 285

Write structures of the following compounds:

1-Chloro-4-ethylcyclohexane

Q 1.2 | Page 285

Write structures of the following compounds:

4-tert. Butyl-3-iodoheptane

Q 1.3 | Page 285

Write structures of the following compounds:

1,4-Dibromobut-2-ene

Q 1.4 | Page 285

Write structures of the following compounds:  1-Bromo-4-sec. butyl-2-methylbenzene

Q 1.5 | Page 285

Why is sulphuric acid not used during the reaction of alcohols with KI?

Q 2 | Page 289

Write structures of different dihalogen derivatives of propane.

Q 3 | Page 289

Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields

(i) A single monochloride.

(ii) Three isomeric monochlorides.

(iii) Four isomeric monochlorides.

Q 4 | Page 289

Draw the structures of major monohalo products in each of the following reactions:

Q 5.1 | Page 289

Draw the structures of major monohalo products in each of the following reactions:

Q 5.2 | Page 289

Draw the structures of major monohalo products in each of the following reactions:

Q 5.3 | Page 289

Draw the structures of major monohalo products in each of the following reactions:

Q 5.4 | Page 289

Draw the structures of major monohalo products in each of the following reactions:

`CH_3CH_2Br + NaI ->`

Q 5.5 | Page 289

Draw the structures of major monohalo products in each of the following reactions

Q 5.6 | Page 289

Arrange each set of compounds in order of increasing boiling points

Bromomethane, Bromoform, Chloromethane, Dibromomethane.

Q 6.1 | Page 291

Arrange each set of compounds in order of increasing boiling points.

1-Chloropropane, Isopropyl chloride, 1-Chlorobutane.

Q 6.2 | Page 291

Which alkyl halide from the following pairs would you expect to react more rapidly by an SN2 mechanism? Explain your answer.

`CH_3CH_2CH_2CH_2Br` or  

Q 7.1 | Page 307

In the following pairs of halogen compounds, which compound undergoes faster SN1 reaction?

Q 8.1 | Page 307

In the following pairs of halogen compounds, which compound undergoes faster SN1 reaction?

Q 8.2 | Page 307

Identify A, B, C, D, E, R and R1 in the following:

Q 9 | Page 307

Pages 310 - 312

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

(CH3)2CHCH(Cl)CH3

Q 1.01 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

CH3CH2CH(CH3)CH(C2H5)Cl

Q 1.02 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

CH3CH2C(CH3)2CH2I

Q 1.03 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

(CH3)3CCH2CH(Br)C6H5

Q 1.04 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

CH3CH(CH3)CH(Br)CH3

Q 1.05 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

CH3C(C2H5)2CH2Br

Q 1.06 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

CH3C(Cl)(C2H5)CH2CH3

Q 1.07 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

CH3CH=C(Cl)CH2CH(CH3)2

Q 1.08 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

CH3CH=CHC(Br)(CH3)2

Q 1.09 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

p-ClC6H4CH2CH(CH3)2

Q 1.1 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

m-ClCH2C6H4CH2C(CH3)3

Q 1.11 | Page 310

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

 o-Br-C6H4CH(CH3)CH2CH3

Q 1.12 | Page 310

Give the IUPAC name of the following compounds:

CH3CH(Cl)CH(Br)CH3

Q 2.1 | Page 310

Give the IUPAC name of the following compounds

CHF2CBrClF

 

Q 2.2 | Page 310

Give the IUPAC name of the following compounds:

ClCH2C≡CCH2Br

Q 2.3 | Page 310

Give the IUPAC names of the following compounds:

(CCl3)3CCl

Q 2.4 | Page 310

Give the IUPAC names of the following compounds:

CH3C(p-ClC6H4)2CH(Br)CH3

Q 2.5 | Page 310

Give the IUPAC names of the following compounds:

(CH3)3CCH=CClC6H4I-p

 

Q 2.6 | Page 310

Write the structures of the following organic halogen compounds.

p-Bromochlorobenzene

Q 3.2 | Page 310

Write the structures of the following organic halogen compounds.

2-(2-Chlorophenyl)-1-iodooctane

Q 3.4 | Page 310

Write the structures of the following organic halogen compounds.

2-Bromobutane

Q 3.5 | Page 310

Write the structures of the following organic halogen compounds

4-tert-Butyl-3-iodoheptane

Q 3.6 | Page 310

Write structures of the following compounds:

1,4-Dibromobut-2-ene

Q 3.8 | Page 310

Which one of the following has the highest dipole moment?

(i) CH2Cl2

(ii) CHCl3

(iii) CCl4

Q 4 | Page 311

A hydrocarbon C5H10 does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. Identify the hydrocarbon.

Q 5 | Page 311

Write the isomers of the compound having formula C4H9Br.

Q 6 | Page 311

Write the equations for the preparation of 1−iodobutane from 1-butanol

 

Q 7.1 | Page 311

Write the equations for the preparation of 1−iodobutane from 1-chlorobutane

Q 7.2 | Page 311

Write the equations for the preparation of 1−iodobutane from but-1-ene.

Q 7.3 | Page 311

What are ambident nucleophiles? Explain with an example.

Q 8 | Page 311

Which compound in each of the following pairs will react faster in SN2 reaction with OH?

CH3Br or CH3I

Q 9.1 | Page 311

Which compound in each of the following pairs will react faster in SN2 reaction with OH?

(CH3)3CCl or CH3Cl

Q 9.2 | Page 311

Predict all the alkenes that would be formed by dehydrohalogenation of the following halides with sodium ethoxide in ethanol and identify the major alkene:

1-Bromo-1-methylcyclohexane

Q 10.1 | Page 311

Predict all the alkenes that would be formed by dehydrohalogenation of the following halides with sodium ethoxide in ethanol and identify the major alkene

2-Chloro-2-methylbutane

Q 10.2 | Page 311

Predict all the alkenes that would be formed by dehydrohalogenation of the following halides with sodium ethoxide in ethanol and identify the major alkene:

2,2,3-Trimethyl-3-bromopentane.

Q 10.3 | Page 311

How will you bring about the following conversions?

Benzene to biphenyl.

Q 11.1 | Page 311

How will you bring about the following conversions?

Ethanol to but-1-yne

Q 11.1 | Page 311

How will you bring about the following conversions?

Ethane to bromoethene

Q 11.2 | Page 311

How will you bring about the following conversions?

Propene to 1-nitropropane

Q 11.3 | Page 311

How will you bring about the following conversions?

Toluene to benzyl alcohol

Q 11.4 | Page 311

How will you bring about the following conversions?

Propene to propyne

Q 11.5 | Page 311

How will you bring about the following conversions?

Ethanol to ethyl fluoride

Q 11.6 | Page 311

How will you bring about the following conversions?

Bromomethane to propanone

Q 11.7 | Page 311

How will you bring about the following conversions?

But-1-ene to but-2-ene

Q 11.8 | Page 311

How will you bring about the following conversions?

1-Chlorobutane to n-octane

Q 11.9 | Page 311

Explain why alkyl halides, though polar, are immiscible with water?

Q 12.2 | Page 311

Explain why Grignard reagents should be prepared under anhydrous conditions?

Q 12.3 | Page 311

Give the uses of freon 12, DDT, carbon tetrachloride and iodoform.

Q 13 | Page 311

Write the structure of the major organic product in each of the following reactions:

Q 14.1 | Page 311

Write the structure of the major organic product in each of the following reactions:

Q 14.2 | Page 311

Write the structure of the major organic product in each of the following reactions:

Q 14.3 | Page 311

Write the structure of the major organic product in each of the following reactions

CH3CH2Br + KCN 

Q 14.4 | Page 311

Write the structure of the major organic product in each of the following reactions

C6H5ONa + C2H5Cl →

Q 14.5 | Page 311

Write the structure of the major organic product in each of the following reactions:

CH3CH2CH = CH2 + HBr 

Q 14.7 | Page 311

Write the structure of the major organic product in each of the following reactions:

`CH_3CH = C(CH_3)_2 + HBr ->`

Q 14.8 | Page 311

Write the mechanism of the following reaction:

nBuBr + KCN     nBuCN

Q 15 | Page 311

Arrange the compounds of each set in order of reactivity towards SN2 displacement:

2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane

Q 16.1 | Page 311

Arrange the compounds of each set in order of reactivity towards SN2 displacement:

1-Bromo-3-methylbutane, 2-Bromo-2-methylbutane, 3-Bromo-2- methylbutane

Q 16.2 | Page 311

Arrange the compounds of each set in order of reactivity towards SN2 displacement:

1-Bromobutane, 1-Bromo-2,2-dimethylpropane, 1-Bromo-2-methylbutane, 1-Bromo-3-methylbutane.

Q 16.3 | Page 312

Out of C6H5CH2Cl and C6H5CHClC6H5, which is more easily hydrolysed by aqueous KOH?

Q 17 | Page 312

p-Dichlorobenzene has higher m.p. and lower solubility than those of o- and m-isomers. Discuss.

Q 18 | Page 312

How the following conversions can be carried out?

Propene to propan-1-ol

Q 19.01 | Page 312

How the following conversions can be carried out ?

Ethanol to but-1-yne

Q 19.02 | Page 312

How the following conversions can be carried out?

1-Bromopropane to 2-bromopropane

Q 19.03 | Page 312

How the following conversions can be carried out?

Benzene to 4-bromonitrobenzene

Q 19.05 | Page 312

How the following conversions can be carried out?

Benzyl alcohol to 2-phenylethanoic acid

Q 19.06 | Page 312

How do you convert the following:

Ethanol to propanenitrile

Q 19.07 | Page 312

How the following conversions can be carried out?

Aniline to chlorobenzene

Q 19.08 | Page 312

How the following conversions can be carried out?

2-Chlorobutane to 3, 4-dimethylhexane

Q 19.09 | Page 312

How the following conversions can be carried out?

2-Methyl-1-propene to 2-chloro-2-methylpropane

Q 19.1 | Page 312

How the following conversions can be carried out?

Ethyl chloride to propanoic acid

Q 19.11 | Page 312

How the following conversions can be carried out?

But-1-ene to n-butyliodide

Q 19.12 | Page 312

How the following conversions can be carried out?

2-Chloropropane to 1-propanol

Q 19.13 | Page 312

How the following conversions can be carried out?

Isopropyl alcohol to iodoform

Q 19.14 | Page 312

How the following conversions can be carried out?

Chlorobenzene to p-nitrophenol

Q 19.15 | Page 312

How the following conversions can be carried out?

2-Bromopropane to 1-bromopropane

Q 19.16 | Page 312

How the following conversions can be carried out?

Chloroethane to butane

Q 19.17 | Page 312

How the following conversions can be carried out?

Benzene to diphenyl

Q 19.18 | Page 312

How the following conversions can be carried out?

tert-Butyl bromide to isobutyl bromide

Q 19.19 | Page 312

How the following conversions can be carried out?

Aniline to phenylisocyanide

Q 19.2 | Page 312

The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH, alkenes are major products. Explain.

Q 20 | Page 312

Primary alkyl halide C4H9Br (a) reacted with alcoholic KOH to give compound (b).Compound (b) is reacted with HBr to give (c) which is an isomer of (a). When (a) is reacted with sodium metal it gives compound (d), C8H18 which is different from the compound formed when n-butyl bromide is reacted with sodium. Give the structural formula of (a) and write the equations for all the reactions

Q 21 | Page 312

Write the main products when

n-butyl chloride is treated with alcoholic KOH.

Q 22.1 | Page 312

What happens when bromobenzene is treated with Mg in the presence of dry ether

Q 22.2 | Page 312

What happens when chlorobenzene is subjected to hydrolysis

Q 22.3 | Page 312

What happens when ethyl chloride is treated with aqueous KOH

Q 22.4 | Page 312

What happens when methyl bromide is treated with sodium in the presence of dry ether

Q 22.5 | Page 312

What happens when methyl chloride is treated with KCN.

Q 22.6 | Page 312

Write the structure of the major organic product in each of the following reactions:

CH3CH2CH2OH + SOCl2 →

Q 41.6 | Page 311

NCERT Chemistry Class 12 Part 2

Chemistry Textbook for Class 12 Part 2
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