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)A, B and C only✓ Correct
(B)B, C and D only
(C)A, B and D only
(D)B and D only
Answer: (A)
Solution
In column chromatography a more polar component binds the stationary phase more strongly and moves down the column more slowly, so the band nearest the outlet is the least polar and leaves first. In the column shown, band c lies at the bottom and band a at the top, making c the least polar, which elutes first, and a the most polar, which elutes last and stays in the column longest; the order of elution is c, then b, then a. Consequently the statement that c is more polar than a and b is wrong, the statement that a is least polar is wrong, and the statement that b leaves before c and after a is wrong, while only the statement that a spends more time in the column is correct. The incorrect statements are A, B and C.
JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option
