Which of the following combinations can be used to synthesise ethanol?

C H_{3} M g I

and

C H_{3} C O C H_{3}

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C H_{3} M g I

and

C_{2} H_{5} O H

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C H_{3} M g I

and

C H_{2} O

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C H_{3} M g I

and

H C O C_{2} H_{5}

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Solution

The correct option is A $C H_{3} M g I$ and $C H_{2} O$
To produce primary alcohol, the Grignard reagent is reacted with formaldehyde and with any other aldehyde will lead to a secondary alcohol. Reacting a Grignard reagent with a ketone will generate tertiary alcohol.

Ethanol $(C H_{3} C H_{2} O H)$ is a primary alcohol. So, the Grignard reagent will react with formaldehyde and the Grignard reagent ill be $C H_{3} M g I$ .

Hence, option $C$ is correct.

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