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Important conversions and reactions for CBSE and ISC Board students

Conversions -

Exercise - 01

(i) Ethanol to but-1-yne

(ii) Ethane to bromoethene

(iii) Propene to 1-nitropropane

(iv) Toluene to benzyl alcohol

(v) Propene to propyne

(vi) Ethanol to ethyl fluoride

(vii) Bromomethane to propanone

(viii) But-1-ene to but-2-ene

(ix) 1-Chlorobutane to n-octane

(x) Benzene to biphenyl

Conversions -

Exercise - 02

(i) Propene to propan-1-ol

(ii) Ethanol to but-1-yne

(iii) 1-Bromopropane to 2-bromopropane

(iv) Toluene to benzyl alcohol

(v) Benzene to 4-bromonitrobenzene

(vi) Benzyl alcohol to 2-phenylethanoic acid

(vii) Ethanol to propanenitrile

(viii) Aniline to chlorobenzene

(ix) 2-Chlorobutane to 3, 4-dimethylhexane

(x) 2-Methyl-1-propene to 2-chloro-2-methylpropane

(xi) Ethyl chloride to propanoic acid

(xii) But-1-ene to n-butyliodide

(xiii) 2-Chloropropane to 1-propanol

(xiv) Isopropyl alcohol to iodoform

(xv) Chlorobenzene to p-nitrophenol

(xvi) 2-Bromopropane to 1-bromopropane

(xvii) Chloroethane to butane

(xviii) Benzene to diphenyl

(xix) tert-Butyl bromide to isobutyl bromide (xx) Aniline to phenylisocyanide

Conversions -

Exercise - 03

What happens when -

(i) n-butyl chloride is treated with alcoholic KOH,

(ii) bromobenzene is treated with Mg in the presence of dry ether,

(iii) chlorobenzene is subjected to hydrolysis,

(iv) ethyl chloride is treated with aqueous KOH,

(v) methyl bromide is treated with sodium in the presence of dry ether,

(vi) methyl chloride is treated with KCN?

Conversions -

Exercise - 04

How will you bring about following conversions?

(i) Chlorobenzene to phenol

(ii) Isopropyl bromide to n-propyl bromide

(iii) Aniline to iodobenzene

Conversions -

Exercise - 05

Give equations of the following reactions:

(i) Oxidation of propan-1-ol with alkaline KMnO4 solution.

(ii) Bromine in CS2 with phenol.

(iii) Dilute HNO3 with phenol.

(iv) Treating phenol with chloroform in presence of aqueous NaOH.

Conversions -

Exercise - 06

Name the reagents used in the following reactions:

(i) Oxidation of primary alcohol to carboxylic acid

(ii) Oxidation of a primary alcohol to aldehyde.

(iii) Bromination of phenol to 2, 4, 6-tribromophenol

(iv) Benzyl alcohol to benzoic acid.

(v) Dehydration of propan-2-ol to propene.

(vi) Butan-2-one to butan-2-ol

(vii) A primary alcohol to aldehyde

(viii) Butan-2-one to butan-2-ol

(ix) Benzyl alcohol to benzoic acid

Conversions -

Exercise - 07

Write equations of the following reactions:

(i) Friedel–Crafts reaction—alkylation of anisole

(ii) Nitration of anisole

(iii) Bromination of anisole in ethanoic acid medium

(iv) Friedel–Crafts acetylation of anisole.

Conversions -

Exercise - 08

How do you convert the following:

(i) Phenol to anisole

(ii) Propan-2-ol to 2-methylpropan-2-ol

(iii) Aniline to phenol

Conversions -

Exercise - 09

How will you bring the following conversions?

(i) Phenol to benzyl alcohol

(ii) Phenol to m-bromophenol

(iii) Phenol to aspirin

Conversions -

Exercise - 10

How would you obtain the following?

(i) Benzoquinone from phenol

(ii) 2-Methylpropan-2-ol from methylmagnesium bromide

(iii) Propan-2-ol from propene

Conversions -

Exercise - 11

What happens when

(i) (CH3)3C—OH is treated with Cu at 573 K,

(ii) Anisole is treated with CH3Cl/anhydrous AlCl3,

(iii) Phenol is treated with Zn dust?

(iv) Salicylic acid is treated with (CH3CO)2O/H+?

(v) Phenol is oxidised with Na2Cr2O7/H+?

(vi) Anisole is treated with CH3Cl/anhydrous AlCl3?

(vii) phenol reacts with bromine water?

(viii) ethanol reacts with CH3COCl/pyridine?

(ix) anisole reacts with HI?

(x) Phenol is treated with conc. HNO3.

(xi) Bromine in CS2 with phenol

(xii) Sodium t-butoxide is treated with CH3Cl.

(xiii) phenol reacts with bromine water?

(xiv) ethanol reacts with CH3COCl/pyridine?

(xv) anisole reacts with HI?

(xvi) Treating phenol with chloroform in the presence of aq. NaOH

Write chemical equations in support of your answer.

Conversions -

Exercise - 12

Show how each of the following compounds can be converted to benzoic acid:

(i) Ethylbenzene

(ii) Acetophenone

(iii) Bromobenzene

(iv) Phenylethene (Styrene)

Conversions -

Exercise - 13

What is meant by the following terms? Give an example of the reaction in each case.

(i) Cyanohydrin

(ii) Acetal

(iii) Semicarbazone

(iv) Aldol

(v) Hemiacetal

(vi) Oxime

(vii) Ketal

(viii) Imine

(ix) 2, 4-DNP derivative

(x) Schiff’s base

Conversions -

Exercise - 14

Predict the products formed when cyclohexanecarbaldehyde reacts with following reagents:

(i) PhMgBr and then H3O+

(ii) Tollens’ reagent

(iii) Semicarbazide and weak acid

(iv) Excess ethanol and acid

(v) Zinc amalgam and dilute hydrochloric acid.

Conversions -

Exercise - 15

How will you prepare the following compounds from benzene? You may use any inorganic reagent

and any organic reagent having not more than one carbon atom.

(i) Methyl benzoate

(ii) m-nitrobenzoic acid

(iii) p-nitrobenzoic acid

(iv) Phenylacetic acid

(v) p-nitrobenzaldehyde

Conversions -

Exercise - 16

How will you bring about the following conversions in not more than two steps?

(i) Propanone to Propene

(ii) Benzoic acid to Benzaldehyde

(iii) Ethanol to 3-Hydroxybutanal

(iv) Benzene to m-Nitroacetophenone

(v) Benzaldehyde to Benzophenone

(vi) Bromobenzene to 1-Phenylethanol

(vii) Benzaldehyde to 3-Phenylpropan-1-ol

(viii) Benzaldehyde to a-Hydroxyphenylacetic acid

(ix) Benzoic acid to m-Nitrobenzyl alcohol

Conversions -

Exercise - 17

Do the following conversions: [CBSE Delhi 2017]

(i) Benzoic acid to Benzaldehyde

(ii) Ethyl benzene to Benzoic acid

(iii) Propanone to Propene

(iv) Benzoic acid to Benzaldehyde

(v) Ethyne to Ethanal

(vi) Acetic acid to Methane

(vii) Ethanal to 3-hydroxybutanal

(viii) Benzoic acid to m-nitrobenzyl alcohol

(ix) Benzaldehyde to benzophenone

(x) Benzoic acid to aniline

(xi) Bromomethane to ethanol

(xii) Ethyl benzene to benzene

(xiii) Acetaldehyde to butane-1, 3-diol

(xiv) Acetone to propene

(xv) Benzene into aniline,

(xvi) Benzene into N, N-dimethylaniline

(xvii) Aniline into 1, 3, 5-tribromobenzene

Conversions -

Exercise - 18

How will you convert

(i) Ethanoic acid to methanamine

(ii) Hexanenitrile to 1-aminopentane

(iii) Methanol to ethanoic acid

(iv) Ethanamine to methanamine

(v) Ethanoic acid to propanoic acid

(vi) Methanamine to ethanamine

(vii) Nitromethane to dimethylamine

(viii) Propanoic acid to ethanoic acid?

Conversions -

Exercise - 19

Write short notes on the following:

(i) Carbylamine reaction

(ii) Diazotisation

(iii) Hofmann’s bromamide reaction

(iv) Coupling reaction

(v) Ammonolysis

(vi) Acetylation

(vii) Gabriel phthalimide synthesis

Conversions -

Exercise - 20

Accomplish the following conversions:

(i) Nitrobenzene to benzoic acid

(ii) Benzene to m-bromophenol

(iii) Benzoic acid to aniline

(iv) Aniline to 2, 4, 6-tribromofluorobenzene

(v) Benzyl chloride to 2-phenylethanamine

(vi) Chlorobenzene to p-chloroaniline

(vii) Aniline to p-bromoaniline

(viii) Benzamide to toluene

(ix) Aniline to benzyl alcohol

Conversions -

Exercise - 21

How are the following conversions carried out:

(i) Aniline to fluorobenzene

(ii) Benzene diazonium chloride to benzene

(iii) Methyl chloride to ethylamine

(iv) Aniline to chlorobenzene

(v) Ethanoic acid to methanamine

(vi) Benzene diazonium chloride to phenol

(vii) N-phenylethanamide to p-bromoaniline

(viii) Benzene diazonium chloride to nitrobenzene

(ix) Benzoic acid to aniline

(x) Ethanamine into methanamine

(xi) Aniline into 1,3,5-tribromobenzene

(xii) Aniline into 4-bromoaniline

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