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(A) The reaction sequence is as follows:$1$. $CH_3COOH + SOCl_2 \rightarrow CH_3COCl$ ($A$ is acetyl chloride).$2$. $CH_3COCl + C_6H_6 \xrightarrow{An

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$2-$hydroxy$-2-$phenylpropanoic acid

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(A) The reaction sequence is as follows:$1$. $CH_3COOH + SOCl_2 \rightarrow CH_3COCl$ ($A$ is acetyl chloride).$2$. $CH_3COCl + C_6H_6 \xrightarrow{Anhyd. AlCl_3} C_6H_5COCH_3$ ($B$ is acetophenone,a Friedel-Crafts acylation reaction).$3$. $C_6H_5COCH_3 + HCN \rightarrow C_6H_5C(OH)(CH_3)CN$ ($C$ is acetophenone cyanohydrin,a nucleophilic addition reaction).$4$. $C_6H_5C(OH)(CH_3)CN + H_3O^+ \rightarrow C_6H_5C(OH)(CH_3)COOH$ ($D$ is $2-$hydroxy$-2-$phenylpropanoic acid,hydrolysis of the nitrile group).Thus,the final product $D$ is $2-$hydroxy$-2-$phenylpropanoic acid.

In a set of reactions,an acid yielded a product $D$.
$CH_3COOH$ $\xrightarrow{SOCl_2} A$ $\xrightarrow[Anhyd. AlCl_3]{Benzene} B$ $\xrightarrow{HCN} C$ $\xrightarrow{H_3O^+} D$
Identify the product $D$.

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In a set of reactions,an acid yielded a product $D$.$CH_3COOH$ $\xrightarrow{SOCl_2} A$ $\xrightarrow[Anhyd. AlCl_3]{Benzene} B$ $\xrightarrow{HCN} C$ $\xrightarrow{H_3O^+} D$Identify the product $D$.