The purification method based on the difference in solubilities of the compound and the impurities in a solvent is -
1. Crystallisation
2. Distillation
3. Chromatography
4. Isolation

Functional isomer is not possible for:
1. Alcohols
2. Aldehydes
3. Alkyl halides
4. Cyanides

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapor in the vapor phase. A suitable method for the extraction of these oils from the flowers is

Paper chromatography operates based on which of the following principles?

1. Adsorption

2. Partition

3. Solubility 

4. Volatility

The correct order of decreasing stability of the following carbocations is:

Which of the following carbon marked with asterisk is expected to have greatest positive charge?

Which carboxylate ion among the following is the most stable?

1.		2.
3.		4.

Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. The major intermediate formed in the first step is:

\(\mathrm{H}_3 \mathrm{C}-\mathrm{HC}=\mathrm{CH}_2+\mathrm{H}^{+} \rightarrow \text { ? }\)${\mathrm{}}_{}$

1. $2°$ carbanion

2. $1°$ carbocation

3. $2°$ carbocation

4. $1°$ carbanion

The correct representation involving heterolytic fission of ${\mathrm{CH}}_3-\mathrm{Br}$ among the following is:

1.
2.
3.
4.