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
1. | a, and c | 2. | a, and b only |
3. | only a | 4. | b and c only |
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
Assertion (A): | CCl4 doesn't give precipitate of AgCl on heating with AgNO3. |
Reason (R): | CCl4 is a non-polar molecule. |
1. | (A) is True and (R) is the correct explanation of (A). |
2. | (A) is True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False |
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 |