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Why would the presence of water in glassware prevent an experiment for the formation of benzoic...

Why would the presence of water in glassware prevent an experiment for the formation of benzoic acid?

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The Grignard reagent ( phenyl magnesium bromide) formed during the reaction is sensitive to water. The Grignard reagent is a strong base and lso strong nucleophile. So, it will react with molecules having acidic protons such as water. The side reaction taking place in presence water is shown below

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