(chemistry major only please) organic chemistry I lab reports

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(chemistry major only please) organic chemistry I lab reports (chemistry major only please) organic chemistry I lab reports organic chemistry I lab reports organic chemistry I lab reports

Experiment 9: Column Chromatography Post-Laboratory Questions Name: 1. Predict the order of elution of a mixture of triphenylmethanol, biphenyl, benzoic acid, and methyl benzoate from an alumina column. 2. What would have been the result if a large quantity of petroleum ether alone were used as the eluent in the experiment you just performed?
Experiment 10: The SN2 Reaction: 1-bromobutane Post-Laboratory Questions Name: 1 Write complete reaction mechanisms for formation of 1-bromobutane and also show how 1-butene and di-n-butyl ether are formed.
Experiment 9: Column Chromatography Pre-Laboratory Questions Name: 1. The following two solvent systems were found to separate compounds X and Y by flash chromatography: • X: hexanes/ethyl acetate 10:1 • Y: hexanes/ethyl acetate 10:4 Which is the more polar compound, X or Y? 2. In order to separate a mixture of X and Y as in problem (2) by column chromatography: a. Which solvent system must be used first? b. Which compound will elute from the column first (assuming you chose the correct solvent)?
Experiment 10: The SN2 Reaction Pre-Laboratory Questions Name: Give possible mechanisms (SN1/SN2) for the following reaction and explain your choices.

Tutor Answer

Prof_karsis
School: Boston College

Attached.

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Running Head: Column Chromatography

Experiment 9: Column Chromatography (Post-laboratory Questions)

Student name
Institutional affiliation:

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Column Chromatography
Experiment 9: Column Chromatography
Post-laboratory Questions

1. Predict the order of elution of a mixture of triphenylmethanol, biphenyl, benzoic acid,
and methyl benzoate from an alumina column.

The alumina column uses the same mechanism as the TLC plate to separate
chemicals. The chemical to elute first is the least polar one as it moves faster while
the chemical to elute last is the most polar one as it moves faster. This is because a
compounds polarity is dependent on the functional groups. We determinje the polar
functional group for every compound and it follows that methyl benzoate has ester (CO2R), carboxylic acid (-CO2H) is contain in Benzoic acid, aromatic hydrocarbons
are contain in Biphenyl and hydroxyl group (-OH) is contain in Triphenylmethanol as
shown

in

the

figures

below:

3
Column Chromatography

Therefore, the polarity order for these functional groups is as follows:

Aromatic < Ester < Hydroxyl < Carbonxylic acid. This implies that benzoic acid is
the most polar eluting last while biphenyl is the least polar eluting first. The order
thus is: Biphenyl, methyl benzoate, triphenymethanol, and benzoic acid.

2. What would have been the result if a large quantity of petroleum ether alone were used
as the eluent in the experiment you just performed?

It is worth noting that petroleum ether is actually not an in the sense of functional group,
but it is a composition of isomeric pentanes. It is nonpolar since it is comprises of
aliphatic hydrocarbons, a solvent that is less polar compared to hexanes. Moreover, the
first two experiments involves eluting columns using hexanes. This implies that the
elution of the two compounds using petroleum ether, the compounds will even be slower.
Therefore, a lot of ...

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Anonymous
Totally impressed with results!! :-)

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