Question

From the figure of column chromatography given below, identify incorrect 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 
Choose the correct answer from the options given below

• A. B, C and D only
• B. A, B and C only
• C. B and D only
• D. A, B and D only

Answer 1

The Correct Option is B

To solve this problem, we need to understand the concept of column chromatography and how polarity affects the retention time of compounds on the column.

In column chromatography, compounds are separated based on their polarity. The less polar compounds tend to move faster through the column than more polar compounds, assuming a polar stationary phase like silica gel is used. 

1. From the image, we observe:
   • Compound 'a' is at the top.
   • Compound 'b' is in the middle.
   • Compound 'c' is at the bottom.
2. Let's analyze the statements:
   • Statement A: "Compound 'c' is more polar than 'a' and 'b'."
     • This is correct, as compound 'c' is retained the longest, indicating higher polarity.
   • Statement B: "Compound 'a' is least polar."
     • This is correct, as compound 'a' moves fastest and is least retained.
   • Statement C: "Compound 'b' comes out of the column before 'c' and after 'a'."
     • This is correct, as compound 'b' is positioned between 'a' and 'c'.
   • Statement D: "Compound 'a' spends more time in the column."
     • This is incorrect, as compound 'a,' being the least polar, spends the least time in the column.
3. Based on these evaluations, the incorrect statements are A, B, and C only.

Therefore, the correct answer is: A, B, and C only.