Identify the product formed in the following reaction. CH_3CH_2MgBr [ii) ,dil ,HCl] i) ,dry ,ice ,/ ,dry ,ether product

MHT CET 2024 Chemistry question

Identify the product formed in the following reaction. CH_3CH_2MgBr \xrightarrow[ii)\,dil\,HCl]{i)\,dry\,ice\,/\,dry\,ether} product

(A)Ethanoic acid
(B)Propanoic acidCorrect
(C)2-Methylpropanoic acid
(D)Butanoic acid

Answer: (B)

Solution

A Grignard reagent adds to the carbonyl carbon of solid carbon dioxide (dry ice) to form a magnesium carboxylate, CH_3CH_2-COO^-MgBr^+; dilute HCl then hydrolyses it to the carboxylic acid: $ + →

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Question ID VK-098937