Which of the following acids cannot be prepar | vedclass

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(C) The reaction of a Grignard reagent $(RMgX)$ with carbon dioxide $(CO_2)$ followed by acid hydrolysis yields a carboxylic acid with one more carbon

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Formic acid

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(C) The reaction of a Grignard reagent $(RMgX)$ with carbon dioxide $(CO_2)$ followed by acid hydrolysis yields a carboxylic acid with one more carbon atom than the original alkyl group $(R)$: $RMgX + CO_2$ $\rightarrow RCOOMgX$ $\xrightarrow{H_3O^+} RCOOH + Mg(OH)X$ To prepare formic acid $(HCOOH)$,the $R$ group would need to be a hydrogen atom $(H)$. However,a Grignard reagent cannot be formed with a hydrogen atom ($HMgX$ does not exist). Therefore,formic acid cannot be prepared using this method. Acetic acid $(CH_3COOH)$ can be prepared using methylmagnesium bromide $(CH_3MgBr)$,and succinic acid can be prepared using appropriate di-Grignard reagents.

Which of the following acids cannot be prepared by a Grignard reagent?

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