In this reaction, CH3CHO + HCNCH3CH(OH)CNH.OHCH3CH(OH)COOH an asymmetric centre 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

 72%
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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 |
 74%
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An ester is boiled with KOH. The product is cooled and acidified with conc. HCl. A white crystalline acid separates. The ester is

1. methyl acetate 

2. ethyl acetate

3. ethyl formate 

4. ethyl benzoate

Subtopic:  Acid Derivatives - Preparation, Properties & Uses |
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The compound formed when malonic acid heated with urea, is                  

1. cinnamic acid

2. butyric acid

3. barbituric acid

4. crotonic acid

Subtopic:  Isomers & Reaction Mechanism |
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The dihedral angle between two C-H bonds in the staggered conformation of ethane  is            

1. 60° 

2. 180°

3. 0° 

4. 120°

Subtopic:  Conformational Isomers |
 60%
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Number of monochlorinated products (excluding stereo-isomers) obtained from the given reaction are :

                           

1. 4 2. 5
3. 6 4. 7
Subtopic:  Structural Isomers |
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 Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

1. but-2-ene                             

2. Butanol

3. but-2-yne                             

4. buten-2-ol   

Subtopic:  Stereo Isomers |
 79%
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An alkane can form Structural isomers if the number of carbon atoms is-

1. 1                                 

2. 2

3. 3                                   

4. 4

Subtopic:  Structural Isomers |
 60%
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Isomerism exhibited by acetic acid and methyl formate is:
1. Functional
2. Chain
3. Geometrical
4. Central 

Subtopic:  Structural Isomers |
 82%
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Which one of the following pairs represents stereoisomerism?                                     

1. Chain isomerism and rotational isomerism

2. Structural isomerism and geometrical isomerism

3. Linkage isomerism and geometrical isomerism

4. Optical isomerism and geometrical isomerism

Subtopic:  Stereo Isomers |
 86%
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