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

The order of stability of the following tautomeric compound is

1. I>II>III              

2. III>II>I

3. II>I>III              

4. II>III>I

Among the following compounds the one that is most reactive towards electrophilic

nitration is

1. benzoic acid

2. nitrobenzene

3. toluene

4. benzene

The correct order of decreasing acid strength of trichloroacetic acid (1), trifluoroacetic

acid (2), acetic acid (3) and formic acid (4) is

1. B>A>D>C        

2. B>D>C>A

3. A>B>C>D        

4. A>C>B>D