What type of product is obtained when formaldehyde react with CH_3MgBr in dry ether?

MHT CET 2024 Chemistry question

What type of product is obtained when formaldehyde react with in dry ether?

(A)Primary alcohol with same number of carbon atoms as in aldehyde
(B)Primary alcohol with one carbon atom more than aldehydeCorrect
(C)Secondary alcohol with one carbon atom more than aldehyde
(D)Tertiary alcohol with two carbon atoms more than aldehyde

Answer: (B)

Solution

Grignard reagents add to the carbonyl group; formaldehyde gives a primary alcohol, other aldehydes give secondary alcohols and ketones give tertiary alcohols. \mathrm{HCHO + CH_3MgBr \xrightarrow{dry\ ether} CH_3CH_2OMgBr \xrightarrow{H_3O^+} CH_3CH_2OH}. The product is ethanol, a primary alcohol with two carbon

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Question ID VK-092928