The correct resonance structures of CH₃COO^- among the following are-
 

1.
2.
3.
4.

 

Consider the possible resonating structures of CH₂=CH–CHO is as follows:


The correct sequence of stability is-

1. II > I > III
2. III > I > II
3. I > III > II
4. I > II > III

Consider the resonance structure of CH₃COOCH₃  as follows:



The correct statement among the following is-

The correct order of stability of following carbocation is-

1. b > a > c
2. a > c > b
3. a > b > c
4. c > b > a

${}_{\mathrm{}}\stackrel{}{}{}_{\mathrm{}}\stackrel{}{}{}_{\mathrm{}}$

On complete combustion, 0.246 g of an organic compound gave 0.198g of carbon dioxide and 0.1014g of water.
The percentage composition of carbon and hydrogen in the compound  are respectively-

1. 21.95 %; 4.58 %
2. 33.46 %; 3.14 %
3. 42.15 %; 2.61 %
4. 25.24 %; 3.98 %

In Dumas’ method for estimation of nitrogen, 0.3g of an organic compound gave 50mL of nitrogen collected at 300K temperature and 715mm pressure. The percentage composition of nitrogen in the compound is-

(Aqueous tension at 300K=15 mm)

1. 21.43%

2. 25.13%

3. 19.46%

4. 17.46%

During estimation of nitrogen present in an organic compound, the ammonia evolved from 0.5 g of the compound in Kjeldahl’s estimation of nitrogen, neutralized 10 mL of 1 M H₂SO₄. The percentage of nitrogen in the compound is-

1. 46.0 %

2. 51.0%

3. 56.0%

4. 49.0%

In Carius method of estimation of halogen, 0.15 g of an organic compound gave 0.12 g of AgBr. 

The percentage of bromine in the compound is-

1. 39.05 %

2. 42.42 %

3. 34.04%

4. 65.12 %

In sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. The percentage of sulphur in the compound is-

1. 39.10 %

2. 48.13 %

3. 42.10 %

4. 52. 43 %

Consider the following compound:
 
Carbon with minimum impact of negative inductive effect of Br is -

1. C₁
2. C₂
3. C₃
4. All have same inductive effect