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(D) Acetophenone $(C_6H_5COCH_3)$ is a ketone.$1$. Oxidation of $1-$phenylethanol $(C_6H_5CH(OH)CH_3)$ using oxidizing agents like $KMnO_4$ or $CrO_3$

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Friedel-Crafts acylation of benzene with ethanoyl chloride in the presence of $AlCl_3$

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(D) Acetophenone $(C_6H_5COCH_3)$ is a ketone.$1$. Oxidation of $1-$phenylethanol $(C_6H_5CH(OH)CH_3)$ using oxidizing agents like $KMnO_4$ or $CrO_3$ yields acetophenone.$2$. Friedel-Crafts acylation of benzene with ethanoyl chloride $(CH_3COCl)$ in the presence of anhydrous $AlCl_3$ is a standard industrial method to prepare acetophenone.Since both $A$ and $D$ are valid methods,and $D$ is the most common textbook method for aromatic ketones,$D$ is the primary answer.

Which of the following methods can be used to prepare acetophenone?

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