Question

Different compounds in the sample mixture travel at different rates up the TLC or the stationery phase, because of which of the following reasons?

• A. due to difference in their attraction to the stationary phase
• B. differences in their solubility in the solvent
• C. differences in their concentration
• D. all of the above

Answer 1

Answer: (A), (B)

The correct options are
A due to difference in their attraction to the stationary phase
B differences in their solubility in the solvent

Different compounds in the sample mixture travel at different rates up the TLC plate because of the following reasons-

1. If the structure of the compound is somewhat similar to the stationery phase, it will try to remain attached to the stationery phase and will move upto a small distance on the TLC plate.

2. If the structure of the compound is somewhat similar to the mobile phase or the solvent, it will try to run along with the mobile phase and thus travel more distance on the TLC plate.

Hence, option A and B are the correct answers.