Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

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

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

Which of the following is not correct for a nucleophile?

1. Nucleophile is a Lewis acid

2. Ammonia is a nucleophile

3. Nucleophiles attack low electron density sites

4. Nucleophiles are not electron seeking

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

Which one among the following is most reactive towards nucleophilic addition reaction?

1.		2.
3.		4.

Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en- 5-ynoic acid is ?

1. 

2.   

3.  

4.   

The structure of isobutyl group in an organic compound is

Which of the following meta-directing substituents in aromatic substitution is the most deactivating?

1. -C≡N

2. -SO₃ H

3. -COOH

4. -NO₂

The radical  is aromatic because it has

1. 6 p-orbitals and 6 unpaired electrons

2. 7 p-orbitals and 6 unpaired electrons

3. 7 p-orbitals and 7 unpaired electrons

4. 6 p-orbitals and 7 unpaired electrons