out of orthonitroaniline and paranitroaniline which one will go at the top of TLC plate and why
It depends upon the stationary phase and the mobile phase, to some extent; however, o-nitroaniline is LESS polar than p-nitroaniline. A polar adsorbent will hold the para isomer more strongly than the orth isomer.
1 answer
Therefore, o-nitroaniline will go to the top of the TLC plate.