JEE Chemistry 2023 Question with Solution

Given: A column chromatography figure with bands labeled $a$, $b$, and $c$.

Find: The incorrect statements.

In column chromatography, the compound that is more strongly adsorbed on the stationary phase spends more time in the column and therefore comes out later.

From the provided solution content:

• Order of polarity: $a > b > c$
• Order of elution: $c > b > a$
• Time spent in the column: $a > b > c$

Now check each statement:

1. A) Compound $c$ is more polar than $a$ and $b$ — this is incorrect.
2. B) Compound $a$ is least polar — this is incorrect.
3. C) Compound $b$ comes out of the column before $c$ and after $a$ — this is incorrect.
4. D) Compound $a$ spends more time in the column — this is correct.

Therefore, the incorrect statements are A, B and C only. Hence, the correct option is B.

Given: The chromatographic bands are labeled $a$, $b$, and $c$.

Find: Which statements are incorrect.

Key idea: In adsorption chromatography, greater adsorption means greater retention time. Hence the compound retained longest leaves the column last.

From the extracted solution:

So, $c$ comes out first, $b$ next, and $a$ last. Therefore:

• Statement A is false.
• Statement B is false.
• Statement C is false.
• Statement D is true.

Thus the set of incorrect statements is A, B and C only, so the correct option is B.