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.

The addition of HCl to an alkene proceeds in two steps. The first step is the attack of H⁺ ion on the double bond portion. The same can be shown as-

1.		2.
3.		4.	All of these are possible

Match the type of mixture of compounds in Column-I with the technique of separation/purification given in Column-II.

Codes:

Match Column I with Column II.

Choose the correct answer from the options given below:

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

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

Paper chromatography operates based on which of the following principles?

1. Adsorption

2. Partition

3. Solubility 

4. Volatility