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(a) Give the mechanism for the formation of ethanol from ethene.  (b) Predict the reagent for carrying out the following conversions :     (i) Phenol to benzoquinone     (ii) Anisole to p-bromoanisole     (iii) Phenol to 2,4,6-tribromophenol
 

(a) Mechanism for the formation of ethanol from ethene- 

 (b) Reagent for carrying out the following conversions :

    (i) Phenol to benzoquinone

  •    K2Cr2O7 + H2SO4

    (ii) Anisole to p-bromoanisole

  •  Br2 in CH3COOH

    (iii) Phenol to 2,4,6-tribromophenol

  •  Br2 aq. / Bromine water

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Out of the following transition elements, the maximum number of oxidation states are shown by 
Option: 1 Sc (Z = 21) 
Option: 2 Cr (Z = 24) 
Option: 3 Mn (Z = 25) 
Option: 4 Fe (Z = 26)

The maximum number of oxidation states are shown by Mn. 

Hence option C is correct 

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Iodoform test is not given by 
Option: 1 Ethanol 
Option: 2 Ethanal 
Option: 3 Pentan-2-one 
Option: 4 Pentan-3-one

Iodoform test is not given by Pentan-3-one

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Give the structures of final products expected from the following reactions :

(i) Hydroboration of propene followed by oxidation with H_{2}O_{2} in alkaline medium.
(ii) Dehydration of (CH_{3})_{3}C-OH by heating it with 20\; ^{o}/_{o}\; H_{3}PO_{4} at 358\; K..

(iii) Heating of  with HI.

 

 
 
 
 
 

Structures of final products expected from the following reactions :

(i) Hydroboration of propene followed by oxidation with H_{2}O_{2} in alkaline medium forms CH3CH2CH2OH

(ii) Dehydration of (CH_{3})_{3}C-OH by heating it with 20\; ^{o}/_{o}\; H_{3}PO_{4} at 358\; K forms (CH3)2C=CH2

(iii) Heating of  with HI forms 

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How can you convert the following ?

(i) Phenol to o-hydroxybenzaldehyde.

(ii) Methanal to ethanol

(iii) Phenol to phenyl ethanoate.

 

 
 
 
 
 

(i) Phenol to o-hydroxybenzaldehyde.

(ii) Methanal to ethanol

(iii) Phenol to phenyl ethanoate.

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Write the reactions showing the presence of following in the open structure of glucose :

(i) an aldehyde group

(ii) a primary alcohol

 

 
 
 
 
 

(i) an aldehyde group

(ii) a primary alcohol

On oxidation with Nitric acid (HNO3),glucose as well as gluconic acid both yeild a dicarboxylic acid (saccharic acid). This indicates the presence of a primary alcoholic group in glucose.

 

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(a) Write the mechanism of the following S_{N}1 reaction :

(CH_{3})_{3}\; C-Br\overset{Aq.NaOH}{\rightarrow}(CH_{3})_{3}\; C-OH+NaBr

(b) Write the equation for the preparation of  2-methyl-2-methoxypropane by Williamson synthesis.

 

 
 
 
 
 

(a)

(CH_{3})_{3}\; C-Br\overset{Aq.NaOH}{\rightarrow}(CH_{3})_{3}\; C-OH+NaBr

\rightleftharpoons\rightleftharpoons 

(b) 

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Write the product(s) of the following reactions :

 

 

 
 
 
 
 

 

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How can you convert the following : 

(i) Sodium phenoxide to o-hydroxybenzoic acid

(ii) Acetone to propene

(iii) Phenol to chlorobenzene

 

 
 
 
 
 

(i) Sodium phenoxide to o-hydroxybenzoic acid

(ii) Acetone to propene

(iii) Phenol to chlorobenzene

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(a) Write the mechanism of the following reaction :

2\; CH_{3}CH_{2}OH\xrightarrow[413K]{H^{+}}CH_{3}CH_{2}OCH_{2}CH_{3}+H_{2}O

(b) Write the preparation of phenol from cumene.

 

 
 
 
 
 

(a) 

2\; CH_{3}CH_{2}OH\xrightarrow[413K]{H^{+}}CH_{3}CH_{2}OCH_{2}CH_{3}+H_{2}O

(b) Preparation of phenol from cumene

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