From the figure of column, chromatography given below, identify incorrect statements.

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:

(1) A, B and D only
(2) A, B and C only
(3) B and D only
(D) B, C and D only


Answer: Option 2
Explanation:
Column chromatography is a technique used to separate and purify individual components from a mixture. It works on the principle of differential adsorption of the components on a stationary phase (solid or liquid) and a mobile phase (liquid or gas). The stationary phase is packed in a column, and the mixture is passed through it. The components of the mixture get separated based on their differential adsorption on the stationary phase.

In the given figure of column chromatography, three compounds labeled as a, b, and c are separated based on their polarity. The more polar compound gets adsorbed more strongly on the stationary phase and takes more time to come out of the column, while the less polar compound gets adsorbed less strongly and comes out of the column quickly. The order of polarity of the compounds is a > b > c, as mentioned in the figure.

A. Compound ‘c’ is more polar than ‘a’ and ‘b’ – This statement is incorrect because the order of polarity is a > b > c, as mentioned in the figure. Therefore, option A is incorrect.

B. Compound ‘a’ is least polar – This statement is incorrect because the order of polarity is a > b > c, as mentioned in the figure. Therefore, option B is incorrect.

C. Compound ‘b’ comes out of the column before ‘c’ and after ‘a’ – This statement is incorrect because the order of compounds coming out of the column is c > b > a, as mentioned in the figure. Therefore, option C is incorrect.

D. Compound ‘a’ spends more time in the column – This statement is correct because the compound that spends more time in the column is the most polar one, which is compound a in this case. Therefore, option D is correct.

Hence, the correct answer is option (2) A, B, and C only.

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