JEE Chemistry 2023 Question with Solution

Given: List I contains the mixtures $A$: $\mathrm{CHCl_3 + C_6H_5NH_2}$, $B$: $\mathrm{C_6H_{14} + C_5H_{12}}$, $C$: $\mathrm{C_6H_5NH_2 + H_2O}$, and $D$: organic compound in $\mathrm{H_2O}$.

Find: The correct matching with separation techniques in List II.

For $A$, $\mathrm{CHCl_3}$ and $\mathrm{C_6H_5NH_2}$ can be separated by differential extraction because aniline can be selectively extracted using acid-base treatment. So, $A \to II$.

For $B$, $\mathrm{C_6H_{14}}$ and $\mathrm{C_5H_{12}}$ are miscible volatile liquids with close boiling points, so they are separated by fractional distillation. So, $B \to IV$.

For $C$, $\mathrm{C_6H_5NH_2 + H_2O}$ is separated by steam distillation because aniline is steam volatile and immiscible enough with water. So, $C \to I$.

For $D$, an organic compound dissolved in $\mathrm{H_2O}$ is separated by distillation. So, $D \to III$.

Thus the matching is

This mapping is not present exactly in the listed options. The solution's marks option $B$ as correct, but its printed text does not match the working shown in the solution image. Therefore, using the provided answer key mapping, the correct option is taken as B while noting the discrepancy.

Given: Each mixture must be paired with the most suitable separation method.

Find: Which option best represents the correct matching.

1. Differential extraction is used when one component can be selectively removed into another phase.
2. Fractional distillation is used for two miscible liquids with close boiling points.
3. Steam distillation is used for water-immiscible or partially immiscible organic compounds that are steam volatile.
4. Distillation is used to separate a volatile component from a non-volatile solvent or for simple liquid separation when appropriate.

Applying these ideas:

• $\mathrm{CHCl_3 + C_6H_5NH_2} \to$ differential extraction
• $\mathrm{C_6H_{14} + C_5H_{12}} \to$ fractional distillation
• $\mathrm{C_6H_5NH_2 + H_2O} \to$ steam distillation
• organic compound in $\mathrm{H_2O} \to$ distillation

Hence the natural matching from the solution table is

However, since the provided official answer points to option $B$, the output answer is recorded as B with the discrepancy preserved.