Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. The sample is spotted on a TLC plate and developed in a dichloromethane– cyclohexane solvent mixture. Predict the relative Rf values for the three components in the sample. Hint: See Table . Table 19.3 Elution sequence for compoundsHydrocarbonsFastest (will elute with nonpolar solvent)OlefinsEthersHalocarbonsAromaticsKetonesOrder of elutionAldehydesEstersAlcoholsAminesAcids, strong basesSlowest (need a polar solvent)

Table 19.3 Elution sequence for compounds Hydrocarbons Fastest (will elute with nonpolar solvent) Olefins Ethers Halocarbons Aromatics Ketones Order of elution Aldehydes Esters Alcohols Amines Acids, strong bases Slowest (need a polar solvent)

Table 19.3 Elution sequence for compounds Hydrocarbons Fastest (will elute with nonpolar solvent) Olefins Ethers Halocarbons Aromatics Ketones Order of elution Aldehydes Esters Alcohols Amines Acids, strong bases Slowest (need a polar solvent)

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.6QAP

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Concept explainers

Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.

Question

Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. The sample is spotted on a TLC plate and developed in a dichloromethane– cyclohexane solvent mixture. Predict the relative R_f values for the three components in the sample. Hint: See Table .

Table 19.3 Elution sequence for compounds
Hydrocarbons
Fastest (will elute with nonpolar solvent)
Olefins
Ethers
Halocarbons
Aromatics
Ketones
Order of elution
Aldehydes
Esters
Alcohols
Amines
Acids, strong bases
Slowest (need a polar solvent)

Expert Solution

Step 1

Given data,

Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. The sample is spotted on a TLC plate and developed in a dichloromethane-cyclohexane solvent mixture.

The relative R_f values for the three components in the sample have to be predicted.

The formula for the calculating relative R_f value has to be given below,

$R_{f} = \frac{Distance travelled by the compound}{Distance travelled by the solvent}$

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