consider the following compounds

hyperconjugation occurs in 

1. I only

2. II only

3. III only

4. I and III

Subtopic:  Electron Displacement Effects |
 62%
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NEET - 2015
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Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

Subtopic:  Nucleophile & Electrophile |
 69%
NEET - 2015
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The enolic form of ethyl acetoacetate is given below. The number of sigma and pi bonds in the enolic form of ethyl acetoacetate are -

1. 18 sigma bonds and 2 pi-bonds

2. 16 sigma bonds and 1 pi-bond

3. 9 sigma bonds and 2 pi-bonds

4. 9 sigma bonds and 1 pi-bond

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 85%
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NEET - 2015
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Given,

Which of the given compounds can exhibit tautomerism?

1. I and II            

2. I and III

3. II and III           

4. I, II and III

Subtopic:  Structural Isomers |
NEET - 2015
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The incorrect statement among the following for a nucleophile is-

1. Nucleophile is a Lewis acid

2. Ammonia is a nucleophile

3. Nucleophiles attack low electron density sites

4. Nucleophiles are not electron seeking

Subtopic:  Nucleophile & Electrophile |
 75%
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NEET - 2015
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In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralised 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is

1. 37.33             2. 45.33

3. 35.33             4. 43.33

 

Subtopic:  Quantitative Analysis of Organic Compounds |
 64%
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NEET - 2014
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Which one among the following is most reactive towards nucleophilic addition reaction?

1. 2.
3. 4.

Subtopic:  Nucleophile & Electrophile |
 73%
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NEET - 2014
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Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en- 5-ynoic acid is ?

1. 

2.   

3.  

4.   

Subtopic:  Nomenclature |
 83%
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The structure of isobutyl group in an organic compound is

Subtopic:  Nomenclature |
 67%
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Some meta-directing substituents in aromatic substitution are given. Which one is most

deactivating:

1. -C≡N

2. -SO3 H

3. -COOH

4. -NO2

Subtopic:  Electron Displacement Effects |
 60%
From NCERT
NEET - 2013
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