JEE MainChemistryGeneral Organic Chemistry
Consider the following physical properties of four unknown organic compounds W, X, Y, and Z: Compound W: Liquid, Boiling Point = 334 K Compound X: Liquid, Boiling Point = 457 K , steam volatile, immiscible with water Compound Y: Solid, undergoes phase change directly to gas upon heating Compound Z: Solid, highly soluble in hot water, sparingly soluble in cold water Identify the CORRECT statement regarding the separat
Options
- AA mixture of W and X must be separated by fractional distillation because both are miscible liquids.
- BA mixture of X and water can be separated by steam distillation, where X distils over with steam and is separa
- CA mixture of Y and Z can be separated by adding hot water, filtering, and cooling the filtrate to crystallize
- DA mixture of Y and a non-volatile impurity can be separated by sublimation, where the impurity is collected as
Correct answer
B. A mixture of X and water can be separated by steam distillation, where X distils over with steam and is separa
Step-by-step solution
Compound W (BP = 334 K ) and Compound X (BP = 457 K ) have a boiling point difference of 123 K . Since the difference is much greater than 25 K , they can be separated by simple distillation, making the statement about fractional distillation incorrect. Compound X is steam volatile and immiscible with water. During steam distillation, a mixture of steam and the volatile organic compound distils over. The condensed liquid consists of two immiscible layers (water and Compound X), which can be separated using a separa