Which of the following reaction sequences con | vedclass

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(A) The conversion of an alcohol to a carboxylic acid with one additional carbon atom involves the following steps:$1$. Conversion of alcohol to alkyl

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$PBr_3, KCN, H_3O^+$

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(A) The conversion of an alcohol to a carboxylic acid with one additional carbon atom involves the following steps:$1$. Conversion of alcohol to alkyl bromide using $PBr_3$: $R-CH_2CH_2OH + PBr_3 \rightarrow R-CH_2CH_2Br + H_3PO_3$.$2$. Nucleophilic substitution with $KCN$ to form a nitrile: $R-CH_2CH_2Br + KCN \rightarrow R-CH_2CH_2CN + KBr$.$3$. Acidic hydrolysis of the nitrile to form a carboxylic acid: $R-CH_2CH_2CN + 2H_2O + H^+ \rightarrow R-CH_2CH_2COOH + NH_4^+$.Thus,the correct sequence is $PBr_3, KCN, H_3O^+$.

Which of the following reaction sequences converts $R-CH_2CH_2OH$ into $R-CH_2CH_2COOH$?

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