Find the method used for the preparation of soda extract.

1. Fusing sodium carbonate with the organic compound mixture, followed by extraction with water

2. Dissolving NaHCO₃ and the organic compound mixture in dilute HCl

3. Boiling Na₂CO₃ and the organic compound mixture with dilute HCl

4. Boiling Na₂CO₃ and a mixture of hydrocarbons in distilled water

The most stable carbocation among the following is:

1.		2.
3.		4.

Find the correct statement regarding the electromeric effect in organic compounds.

1. It is a temporary effect.
2. It is a permanent effect.
3. It is both temporary and permanent.
4. None of the above.

H₂C = O behaves as:

1. Nucleophile

2. Electrophile

3. Both (1) and (2)

4. None of the above 

Which of the following is strongest nucleophile?

1. Br^-

2. $\stackrel{..}{\mathrm{O}}H$

3. $\stackrel{..}{\mathrm{C}}N$

4. ${\mathrm{C}}_2{\mathrm{H}}_5\stackrel{..}{\mathrm{O}}$

The stability of 2,3-dimethyl but-2-ene is more than 2-butene. This can be explained in terms of:

1. resonance

2. hyperconjugation

3. electromeric effect

4. inductive effect

(CH₃)₄N⁺ is neither an electrophile, nor a nucleophile because it:

1. does not have electron pair for donation as well as cannot attract electron pair

2. neither has electron pair available for donation nor can accommodate electron since all shells of N are fully occupied.

3. can act as Lewis acid and base

4. none of the above

Which of the following is an electrophilic reagent?

1. RO^-

2. BF₃

3. NH₃

4. ROH

The-I effect is shown by:

1. -COOH

2. -CH₃

3. -CH₃CH₂

4. -CHR₂

Which of the following is singlet carbene?

1. (CH₃)₃C⁺

2. C₂H₅-CH

3. ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2^{-}$

4. CH₂ =CH-${\mathrm{CH}}_2^{+}$