Answer :

When HCl is added to the Grignard reagent before benzophenone, the Grignard reagent reacts with HCl to form an alkane and MgCl₂. As a result, the Grignard reagent is consumed, and there is no further reaction with benzophenone.

When HCl is added to the Grignard reagent (RMgBr), the following reaction takes place:

RMgBr + HCl ⟶ R-H + MgCl₂

In this reaction, the Grignard reagent reacts with HCl to form an alkane (R-H) and magnesium chloride (MgCl₂). As a result, the Grignard reagent is consumed, and there is no available Grignard reagent to react with benzophenone.

The overall reaction can be represented as:

2RMgBr + 2HCl ⟶ 2R-H + 2MgCl₂

Without the Grignard reagent, benzophenone remains unreacted. Therefore, it is essential to add benzophenone before HCl to ensure that the Grignard reagent reacts with benzophenone to form the desired product.

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Rewritten by : Barada