Purification and Characterisation of Organic Compounds appeared 2 times across 1 year — 4.4% of Chemistry.
This question is from Lassaigne's Test Principles.
Keywords:#Lassaigne test covalent to ionic conversion#JEE Main 2026 Morning Q64#Sodium fusion extract principle#Qualitative Organic Analysis
More Purification and Characterisation of Organic Compounds Previous-Year Questions
Q58neet_2024_05_may_morningSeparation Techniques
Two products X and Y are formed in the following reaction sequence:
Sequence showing alkylation of benzene followed by nitration to form ortho and para nitrotoluenes.
The suitable method that can be used for the separation of products X and Y is:
A. (1) Continuous extraction
B. (2) Differential extraction
C. (3) Fractional distillation
D. (4) Sublimation
Solution
Related Formula
Boiling Point Difference arrow Fractional Distillation$$\text{Boiling Point Difference} \rightarrow \text{Fractional Distillation}$$
Core Logic
Friedel-Crafts reaction gives toluene (W$W$). Nitration of toluene produces o-nitrotoluene (X$X$, B.P. 222^° C$222^\circ C$) and p-nitrotoluene (Y$Y$, B.P. 238^° C$238^\circ C$). Due to close boiling points, fractional distillation is used for separation.
Step 1: Conclusion
Fractional distillation (Option 3) is the suitable method.
Pattern Recognition
Ortho and para isomers with significant boiling point differences are separated by fractional distillation.
Chapter Mix
Class 11 Chemistry: Purification and Characterisation of Organic Compounds
More Purification and Characterisation of Organic Compounds Questions — neet_2024_05_may_morning
Practice past-year questions one chapter at a time. Pick an exam → subject → chapter and get every PYQ for that topic — pulled together from all past papers — with the chapter's key formulas alongside.
