Which of the following compounds give a ketone with grignard reagent?

Formaldehyde

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Ethyl alcohol

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Methyl cyanide

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Methyl iodide

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Solution

The correct option is B Methyl cyanide
Methyl cyanide gives a ketone with grignard reagent. For example, methylcyanide reacts with methyl magnesium bromide to form an adduct magnesium bromide propan-2-ylideneamide which on hydrolysis gives propan-2-one.

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