Read carefully the questions and give your answer in the space provided for each

Question

Read carefully the questions and give your answer in the space provided for each problem. True (T) or False (F) questions: __ TLC can be used to separate enantiomers. __ Ethanol is a better solvent for solvolysis than methanol. __Stabilization of intermediate makes a reaction goes faster. __ Increasing the polarity of the reaction decreases the reaction rate. __NaOH was added to the alpha phenylethylamine salt to deprotonate both the acid and the ammonium salt. Draw both enantiomers of racemic alpha-phenylethlamine: In a hypothetical thin-layer chromatography experiment on silica gel plates, the eluting solvent was a 2/1 mixture of petroleum ether and diethyl ether, and the TLC war visualized by fluorescence and gave the result illustrated below. Estimate the Rf value of compound A Assuming the compounds A and B have similar molecular weights, which compound is more polar? Explain your answer.

Explanation / Answer

Q1

a)

TLC can be used to separate enantiomers --> FALSE, it is not likely that they will separate completely

b)

False, Methanol is better, since it is more polar

c)

stabilization of intermedite makes reaction faster ---> FALSE, we require unstable so they react faster (won't last long due to being unstable)

d)

Polarity will not decrease rate of reaction

e)

NaOh is used to force H+ ions to displace, therefore they deprotonate acid.. NH4+ goes to NH3 in NaOh presence

For all further questions, please post multiple question in multiple set of Q&A. We are only allowed to answer to a single question per Q&A

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