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(D) The first step is the Gattermann-Koch reaction,where benzene reacts with $CO$ and $HCl$ in the presence of anhydrous $AlCl_3$ and $CuCl$ to form b

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$1-$Phenylethenol

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(D) The first step is the Gattermann-Koch reaction,where benzene reacts with $CO$ and $HCl$ in the presence of anhydrous $AlCl_3$ and $CuCl$ to form benzaldehyde $(C_6H_5CHO)$.In the second step,the Grignard reagent $CH_2=CHMgBr$ (vinylmagnesium bromide) undergoes nucleophilic addition to the carbonyl group of benzaldehyde to form an alkoxide intermediate.In the third step,hydrolysis with $H_2O$ converts the alkoxide into the final alcohol product,$1$-phenylethenol $(C_6H_5CH(OH)CH=CH_2)$.

The major product of the following reaction sequence is

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