1) During the synthesis of a Grignard reagent, what is the maximum temperature o

Question

1) During the synthesis of a Grignard reagent, what is the maximum temperature of the reaction mixture before heating under reflux?

A) The reaction temperature is the boiling point of the solvent used, in this case, ethyl ether

B) The reaction temperature is 306 degrees C, the boiling point of benzophenone

C) The reaction temperature is room temperature

D) The reaction temperature is 100 degrees C, the boiling point of water

2) How might your results be affected if you used ethyl ether rather than petroleum ether to remove the biphenyl from the crude triphenylmethanol

A) There will be no change to the results since they are both ethers

B) The triphenylmethanol is soluble in ethyl ether and it will dissolve during the washing step, reducing yield

C) The ethyl ether will react with biphenyl to form additional triphenylmethanol so yield is increased

D) Since ethyl ether is a nonpolar solvent, triphenylmethanol is decomposed to a mixture of benzene and methanol

3) In lower grade diethyl ether samples, ethyl alcohol (C2H3OH) is often present. If this grade of diethyl ether were used, what effect, if any, would the ethyl alcohol have on the Grignard reagent (such as CH3-MgBr) being used?

A) The ehtyl alcohol would not react with the Grignard reagent

B) The Grignard reagent formed would act to deprotonate the ethyl alcohol OH

C) The ethyl alcohol would act to deprotonate the Grignard reagent formed

D) The ethyl alcohol would react with the diethyl ether to form water and quench the formation of the Grignard reagent

Explanation / Answer

1) A

2) B

3) B

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