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

Which nomenclature is not according to IUPAC system?

The correct IUPAC name of the compound

 is

1. 3-ethyl-4-ethenylheptane

2. 3-ethyl-4-propylhex-5-ene

3. 3-(1-ethyl propyl) hex-1-ene

4. 4-ethyl-3-propylhex-1-ene

The Lassaigne's extract is boiled with a concentration HNO₃ while testing for halogens. By doing so it:

1. Helps in the precipitation of AgCl.

2. Increases the solubility product of AgCl.

3. Increases the concentration of NO₃^- ions.

4. Decomposes Na₂S and NaCN, if formed.