Benzoic acid gives benzene on being heated with X and phenol gives benzene on being heated with Y. Therefore, X and Y are respectively                                                              

1. Sodalime and copper

2. Zn dust and NaOH

3. Cu and sodalime

4. Sodalime and zinc dust

Subtopic:  Carboxylic Acids: Preparation & Properties |
 75%
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Which one of the following can be oxidised to the corresponding carbonyl compound?          

1. 2-hydroxy propane

2. Ortho-nitro phenol

3. Phenol

4. 2-methyl-2-hydroxy propane

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 71%
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The -OH group of an alcohol or the -COOH group of a carboxylic acid can be replaced by -Cl using     

1. phosphorus pentachloride

2. hypochlorous acid

3. chlorine

4. hydrochloric acid

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 75%
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Acetone reacts with iodine (I2) to form iodoform in the presence of      

1. CaCO3   

2. NaOH     

3. KOH     

4. MgCO3

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 87%
From NCERT
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A and B in the following reactions are  

1. A=RR'CH2CN,              B=NaOH

2. A=RR'C<COOHOH ,          B=CH3

3. A=RR'C<COOHCN ,          B=CH3

4. A=RR"C<OHCN,              B=LiAlH4

Subtopic:  Aldehydes & Ketones: Preparation & Properties | Isomers & Reaction Mechanism |
 89%
From NCERT
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Acetaldehyde normally reacts with                

1. only electrophiles

2. only nucleophiles

3. only free radicals

4. both electrophiles and nucleophiles

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 55%
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Nucleophilic addition reaction will be most favoured in                   [2006]

1. 
                        O
                        
CH3-CH2-CH2C-CH3

2. (CH3)2C=O

3. CH3CH2CHO

4. CH3CHO

Subtopic:  Isomers & Reaction Mechanism |
 71%
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The enolic form of acetone contains:

1. 9 σ-bonds, 1π-bond and 2 lone pairs

2. 8 σ-bonds, 2π-bonds and 2 lone pairs

3. 10 σ-bonds, 1π-bond and 1 lone pair

4. 9 σ-bonds, 2π-bonds and 1 lone pair

 

 

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 72%
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In this reaction,

CH3CHO + HCN CH3CH(OH)CN H.OHCH3CH(OH)COOH

an asymmetric compound is generated. The acid obtained would be            

1. 50% D + 50% L-isomer

2. 20% D + 80% L-isomer

3. D-isomer

4. L-isomer

Subtopic:  Isomers & Reaction Mechanism |
 84%
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Formaldehyde can be distinguished from acetaldehyde by:

1. Fehling's solution

2. Schiff's reagent

3. Ammonia

4. Ammoniacal AgNO3

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
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