Solution & Explanation
Question: From the figure of column chromatography given, identify the
incorrect statements:
Statements:
- A. Compound 'c' is more polar than 'a' and 'b'
- B. Compound 'a' is least polar
- C. Compound 'b' comes out of the column before 'c' and after 'a'
- D. Compound 'a' spends more time in the column
💡 Core Rule of Chromatography:
- The stationary phase (column material) is polar.
- Highly polar compounds stick strongly to the column and move slowly (stay near the top).
- Non-polar compounds do not stick well and move quickly (drop to the bottom first).
Position Trends (Top to Bottom: a → b → c)
- Polarity: a (Most Polar) > b > c (Least Polar)
- Elution Order (Exit Speed): c comes out first, then b, and a comes out last.
Evaluating Each Statement:
-
❌ Statement A is INCORRECT: It states 'c' is the most polar. Since 'c' moved fastest to the bottom, it is actually the least polar.
-
❌ Statement B is INCORRECT: It states 'a' is the least polar. Since 'a' is stuck at the top, it is the most polar.
-
❌ Statement C is INCORRECT: It states 'b' comes out before 'c'. Because 'c' is at the bottom, 'c' must exit the column before 'b'.
-
✅ Statement D is CORRECT: It states 'a' spends more time in the column. Since 'a' moves the slowest, it stays inside the longest.
Conclusion:
Since we are identifying the incorrect statements, the answer must include A, B, and C.
Correct Answer Option: A, B and C only
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