Organic Chemistry Basics 2 Question 7
7. The correct match between items I and II is
| Item - I (Mixture) |
Item II (Separation method) |
||
|---|---|---|---|
| A. | $\mathrm{H}_{2} \mathrm{O}:$ Sugar | P. | Sublimation |
| B. | $\mathrm{H}_{2} \mathrm{O}:$ Aniline | Q. | Recrystallisation |
| C. | $\mathrm{H}_{2} \mathrm{O}:$ Toluene | R. | Steam distillation |
| S. | Differential extraction |
(2019 Main, 11 Jan I)
(a) $(\mathrm{A}) \rightarrow(\mathrm{Q}) ;(\mathrm{B}) \rightarrow(\mathrm{R}) ;(\mathrm{C}) \rightarrow(\mathrm{S})$
(b) (A) $\rightarrow(\mathrm{Q}) ;(\mathrm{B}) \rightarrow(\mathrm{R}) ;(\mathrm{C}) \rightarrow(\mathrm{P})$
(c) $(\mathrm{A}) \rightarrow(\mathrm{S}) ;(\mathrm{B}) \rightarrow(\mathrm{R}) ;(\mathrm{C}) \rightarrow(\mathrm{P})$
(d) $(\mathrm{A}) \rightarrow(\mathrm{R}) ;(\mathrm{B}) \rightarrow(\mathrm{P}) ;(\mathrm{C}) \rightarrow(\mathrm{S})$
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Answer:
Correct Answer: 7. (a)
Solution:
- The correct option is :
$$ (\mathrm{A}) \rightarrow(\mathrm{Q}) ;(\mathrm{B}) \rightarrow(\mathrm{R}) ;(\mathrm{C}) \rightarrow(\mathrm{S}) $$
(A) $\mathrm{H}{2} \mathrm{O}$ and sugar mixture They do not react chemically. On heating, solubility of sugar in $\mathrm{H}{2} \mathrm{O}$ increases and on rapid cooling of saturated solution, sugar recrystallises $(Q)$.
(B) $\mathrm{H}{2} \mathrm{O}$ and aniline mixture Aniline is steam volatile but insoluble in $\mathrm{H}{2} \mathrm{O}$. So, steam distillation $(R)$ is employed for their separation.
(C) $\mathbf{H}{2} \mathbf{O}$ and toluene mixture Toluene is steam non-volatile and also insoluble in $\mathrm{H}{2} \mathrm{O}$. So, differential extraction method (S) can be used to separate them.
