In one TLC preparation ethylene glycol (i.e., HOCH_2CH_2OH) is used as the eluti

Question

In one TLC preparation ethylene glycol (i.e., HOCH_2CH_2OH) is used as the eluting solvent and in the other, pentane (H_3C(CH_2)_3CH_3) U used. When ethylene glycol is used, the solvent front as well as the sample moves on the TLC plate very slowly, and when pentane is used, the solvent front moves very quickly on the TLC plate but the sample moves very slowly ? "Briefly Explain the interactions between the mobile phase and stationary phase, and between the stationary and sample, as well as the interactions between the mobile and sample." You can ask your instructor for advise.

Explanation / Answer

When ethylene glycol used as solvent , in this case there is H-bond interaction b/w stationary and mobile phase which hinder the movement of slovent front and sample both.

When pentane used as a slovent, we know that pentane is non-polar so there is less H-bonding which only hinder the movent of molecule. Due to non polarity of molecule, the solvent front will move faster.

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