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The final organic product on reaction of bromomethylbenzene is carbonyl compound of ketones.

What are ketones ?

Your body produces ketones, which are acids, when it burns fat for energy. Your body's cells typically use blood glucose (sugar) as an energy source. Consuming carbohydrates provides you with glucose. Your body will burn fat for energy if your cells can't receive enough glucose. This procedure results in ketones.

The substance sodium cyanide is nucleophilic. As a result, CN behaves as a nucleophile. The bromine on the benzyl chloride molecule will act as a leaving group, which causes Br to be replaced with CN. The SN2 substitution reaction is used to carry out this reaction and  4 – bromobenzyl cyanide is formed in the 1st step.

In the next step  4 – bromobenzyl cyanide undergoes two step  reaction with grignard reagent and hydronium ion. and give rise to final product which is a ketone.

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