The most stable carbanion species among the following is- 

1.	\(CCl^-_3\)	2.	\(CH^-_3\)
3.	\(CH_2Cl^-\)	4.	\(CHCl^-_2\)

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%

0.24 g of an organic compound containing phosphorous gave 0.66 g of Mg₂P₂O₇ by the usual analysis. The percentage of phosphorous in the compound is-

1. 77%

2. 72%

3. 87%

4. 60 %

0.1688 g organic compound when analyzed by the Dumas method yields 31.7 mL of moist nitrogen measured at 14º C, and 758 mm mercury pressure. The % of nitrogen in the organic compound (Aqueous tension at 14 º C =12 mm) is-

1. 30.9%

2. 10%

3. 40%

4. 21.9 %

The latest technique for isolation, purification and separation of organic compounds is -

1. Crystallisation

2. Distillation

3. Sublimation

4. Chromatography