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**Reaction of Nitrile with Grignard Reagent**

Grignard reagents react with nitriles to give an intermediate imine anion, which is then hydrolyzed by the addition of water to yield a ketone. The mechanism is similar to the reduction of a nitrile to an amine, except that only one nucleophilic addition occurs instead of two, and the nucleophile is a carbanion rather than a hydride ion.

**Required:**

Draw curved arrows to show the movement of electrons in this step of the mechanism.

Answer :

Answer:

its a.

Explanation:

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Final answer:

The reaction of a nitrile with a Grignard reagent yields an intermediate imine anion that is hydrolyzed to form a ketone. The mechanism involves a nucleophilic attack and subsequent hydrolysis.

Explanation:

The reaction of a nitrile with a Grignard reagent involves several steps. First, the Grignard reagent attacks the nitrile carbon, resulting in the formation of an intermediate imine anion. This imine anion is then hydrolyzed by the addition of water, forming a ketone. The mechanism is similar to the reduction of a nitrile to an amine, except that only one nucleophilic addition occurs and the nucleophile is a carbanion instead of a hydride ion.