Which of the following sequences of reagents | vedclass

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Question

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

Vedclass · Accepted Answer

$PBr_3, KCN, H_3O^+$

Vedclass · Answer

(A) The conversion of an alcohol to a carboxylic acid with an additional carbon atom involves the following steps:$1$. Conversion of alcohol to alkyl bromide using $PBr_3$: $R-CH_2-CH_2-OH \xrightarrow{PBr_3} R-CH_2-CH_2-Br$$2$. Nucleophilic substitution with $KCN$ to form a nitrile: $R-CH_2-CH_2-Br \xrightarrow{KCN} R-CH_2-CH_2-CN$$3$. Acidic hydrolysis of the nitrile to a carboxylic acid: $R-CH_2-CH_2-CN \xrightarrow{H_3O^+} R-CH_2-CH_2-COOH$Thus,the correct sequence is $PBr_3, KCN, H_3O^+$.

Which of the following sequences of reagents is used to convert $R-CH_2-CH_2-OH$ into $R-CH_2-CH_2-COOH$?

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