Nitric acid is added to sodium extract before adding silver nitrate for testing halogens because

1. Nitric acid reduces suphide

2. Nitric acid decomposes NaCN and Na₂S

3. Nitric acid oxidises the organic compound

4. Nitric acid acts as a dehydrating agent

The reason why we fuse an organic compound with metallic sodium for testing nitrogen, sulphur, and halogens is -

1. To convert all compounds to their ionic form

2. Sodium reduces the compounds

3. Sodium converts all compounds in their covalent form

4. None of the above

A mixture of calcium sulphate and camphor can be separated by- 

1. Filtration

2. Evaporation

3. Sublimation

4. Chromatography

A gas among the following that can be absorbed by potassium hydroxide is -

1. Carbon dioxide

2. Silicon dioxide

3. Hydrogen

4. Carbon monoxide 

0.3780 grams of an organic chloro compound gave 0.5740 grams of silver chloride in Carius
estimation. % of chlorine present in the compound is -

1. 25%

2. 37.59%

3. 42%

4. 05.70 %

In the Carius method, 0.468 grams of an organic sulphur compound gives 0.668 grams of barium sulphate.  The percentage of sulphur in the given compound is -

1. 19.59%

2. 25.40%

3. 09.24%

4. 27.59%

The most stable carbocation among the following is-
1. \(({CH_3})_3C\overset{+}{C}H_2\)
2. \(({CH_3})_3\overset{+}{C}\)
3. \({CH_3}CH_2\overset{+}{C}H_2\)
4. \(({CH_3})\overset{+}{C}HCH_2CH_3\)

${\mathrm{O}}_2{\mathrm{NCH}}_2{\mathrm{CH}}_2{\mathrm{O}}^{-}$ is more stable than ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{O}}^{-}$ because -

1. NO₂ shows +I effect

2. NO₂ shows -I effect

3. NO₂ decreases the positive charge on the compound

4. Ethyl group increases positive charge on the compound

Alkyl groups act as electron donors when attached to a π system due to-

1. Inductive effect

2. Mesomeric effect

3. Resonance

4. Hyperconjugation

An electrophile among the following is -

1. ${\mathrm{OH}}^{-}$

2. ${\mathrm{NC}}^{-}$

3. $R_3{C}^{-}$

4. Carbonyl group