Carboxylic acids may be prepared by the reaction of Grignard reagents with :

C O_{2}

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C O

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Formaldehyde

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Formic acid

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Solution

The correct option is A $C O_{2}$
Carboxylic acids may be prepared by the reaction of Grignard reagents with $C O_{2}$ . Dry carbon dioxide is bubbled through a solution of the Grignard reagent in ethoxyethane,The product is then hydrolysed (reacted with water) in the presence of a dilute acid. Finally a carboxylic acid is produced.
$C H_{3} C H_{2} M g B r + O = C = O \to C H_{3} C H_{2} (B r M g O -) C = O$
$C H_{3} C H_{2} (B r M g O -) C = O + H_{2} O \to C H_{3} (H O -) C = O + M g (O H) B r$

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