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07-02-2020
Chemistry

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Benzophenone reacts with phenylmagnesium bromide in ether solution to make triphenylmethanol after acid workup. Which of the following experimental mistakes will decrease the effectiveness of a Grignard reaction

The magnesium ribbon is insoluble in ether.

The glassware was not dried before use.

The fume hood was too cold.

The magnesium ribbon was not wiped clean before use.

Respuesta :

10-02-2020

Answer:

The glassware was not dried before use.

Explanation:

Phenylmagnesium bromide ( grignard reagent ) reacts with water to form benzene

C₆H₅MgBr + WATER--------→ C₆H₆ + Mg (OH) Br

This happens when glassware is not dried before use. It will decrease the effectiveness of the Grignard reagent.

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