ChemistryHardHigh School (11–12)Organic Chemistry: Some Basic Principles and Techniques › Purification and Analysis of Organic CompoundsNEET
Created by StemPy LabThe figure shows two laboratory set-ups, X and Y, used to purify organic liquids. Two statements about them are given below. Statement I: Set-up X is used when the liquids of a mixture boil at close temperatures, as for the fractions of crude oil; the higher boiling part condenses in the column and runs back. Statement II: In set-up Y, the organic liquid distils over only when the flask reaches the boiling point of that liquid, because the steam only brings heat into the flask.
← All Quizzes
← Read these statements about hyperconjugation. (i) In propene, CH₃CH=CH₂, 3 C-H bonds can take part in hyperconjugation. (ii) In 2-methylpropene, (CH₃)₂C=CH₂, 6 such bonds take part. (iii) In the ethyl cation, CH₃CH₂⁺, the two C-H bonds of the CH₂⁺ carbon overlap with its own empty p orbital. (iv) In 3,3-dimethylbut-1-ene, (CH₃)₃C-CH=CH₂, nine C-H bonds take part. (v) Hyperconjugation delocalises the σ electrons of a C-H bond on a carbon next to a π bond or to a vacant p orbital. How many of the statements above are correct?Match each job in List-I with the method of purification that NCERT gives for it in List-II.
List-I (Job)
A. Taking an organic compound out of water by shaking with a solvent that does not mix with water
B. Purifying a solid that dissolves little in a solvent when cold but readily when hot
C. Separating glycerol from spent-lye in the soap industry
D. Separating aniline from a mixture of aniline and water
List-II (Method)
I. Crystallisation
II. Steam distillation
III. Differential extraction
IV. Distillation under reduced pressure →
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