Compare rate of dehydration of (i), (ii) and (iii) by conc. H2SO4.

(a) (i)>(iii)>(ii)                                             (b) (i)>(ii)>(iii)

(c) (ii)>(i)>(iii)                                             (d) (ii)>(iii)>(i)

 

 

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Phenols: Preparation, Properties, Acidic Nature of Phenol
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Product (x) will be:

(a) 

(b) 

(c) 

(d) 

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Alcohols: Preparation, Physical and Chemical Properties
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In each of the following groups, which is the strongest (best) nucleophile ?

(I)(1)H3C-O-            (2)                   (3)H3C-S- in CH3OH

(II)(1)OH-                (2) H2O                        (3) NH2- in DMF

(III) (1)   (2)                  (3) CH3O- in DMSO

(a) I,3; II,3; III,2                                  (b) I,2; II,1; III,3

(c)  I,1; II,2; III,1                                 (d) I,3; II,1; III,3

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Alcohols: Preparation, Physical and Chemical Properties
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(A) on heating isomerizes to (B). What is the structure of (B) ?

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Mechanism of Dehydration, Uses, Methanol and Ethanol
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Which of the following statements is true?

(a) CH3CH2S- is both a stronger base and more nucleophilic than CH3CH2O-

(b) CH3CH2S- is a stronger base but is less nucleophilic than CH3CH2O-

(c) CH3CH2S- is a weaker base but is more nucleophilic than CH3CH2O-

(d) CH3CH2S- is both a weaker base and less nucleophilic than CH3CH2O-

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Alcohols: Preparation, Physical and Chemical Properties
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What sequence of reagents is required to accomplish the following transformation?

1. (1) NBS, ROOR (2) CH3CH2O- (3)2HBr (4) NH-2 (5) disiamylborane (6) H2O2,OH-

2. (1) Cl2hv (2) OH-, heat; (3) 2HCl (4) OH-,heat (5) HgSO4,H2SO4

3. (1) NBs,ROOR; OH-,DMSO

4. (1) Br2,hv (2) t-butoxide (3) BH3,THF (4) H2O2,OH-

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Alcohols: Preparation, Physical and Chemical Properties
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Consider the following alcohols

The order of decreasing reactivities of these alcohols towards substitution with HBr is :
(a) III > I > IV > II

(b) III > I > II > Ⅳ

(c) I > III > IV > II

(d) I > III > II > IV

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Predict the product when given compound reacts with LiAlH4 :

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The labelled -O18 will be in:
(a) H2O
(b) Methyl benzoate
(c) Both (a) and (b)
(d) Benzoic acid

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Alcohols: Preparation, Physical and Chemical Properties
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CO2H|CO2H+CH2|-OH18CH2-OH18H+ (A); Product (A) is:

(a) C|O-O-CH2CO-O-CH2

(b) C|O-O18-CH2|CO-O18-CH2

(c) C|18O-O-CH2|C18O-O-CH2

(d) H-O-CO-CO-O-CH2-CH2-OH

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Alcohols: Preparation, Physical and Chemical Properties
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