The Huckel's rule-based aromaticity is shown by:

(A)		(B)
(C)		(D)
(E)		(F)

 

1.	A, B, D only	2.	B, D only
3.	B, D, E and F only	4.	A, B, D, E & F only

The type of structural isomerism shown by given compounds is-

${\mathrm{CH}}_3-\mathrm{S}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$ and 

If a liquid compound decomposes at or below its boiling point, then the best method for purification is-

1. Distillation under reduced pressure

2. Azeotropic distillation

3. Gas chromatography

4. Sublimation

The most stable carbanion species among the following is- 

The resonance hybrid structure will not exist for- 
a. CH₃OH
b. R - CONH₂
c. CH₃CH = CHCH₂NH₂

Compare the stability of the two resonating structures given below and mark the correct option:

1. (I)  is more stable than (II)

2. (II) is more stable than (I)

3. (I) and (II) both have the same stability 

4. None of the above

0.26 g of an organic compound gave 0.039 g of water and 0.245 g of carbon dioxide on combustion. The percentage of C in the organic compound is-

1. 35%

2. 25%

3. 2%

4. 90%

In an estimation of sulphur by the carius method, 0.2175 g of the substance gave 0.5825 g of BaSO₄ . The percentage composition of S in the compound is-

1. 66%

2. 20%

3. 37%

4.82%

0.284 g of an organic substance gave 0.287 g AgCl in a carius method for the estimation of halogen. The percentage of Cl in the compound is-

1. 5%

2. 18%

3. 25%

4. 33%