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(D) The reaction sequence is as follows:$1$. Hexane undergoes aromatization in the presence of $Cr_2O_3$ at $773 \ K$ and $10-20 \ atm$ to form benzen

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$C_6H_5-COCH_3$

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(D) The reaction sequence is as follows:$1$. Hexane undergoes aromatization in the presence of $Cr_2O_3$ at $773 \ K$ and $10-20 \ atm$ to form benzene $(X)$.$C_6H_{14} \xrightarrow{Cr_2O_3, 773 \ K, 10-20 \ atm} C_6H_6 + 4H_2$$2$. Benzene $(X)$ then undergoes Friedel-Crafts acylation with acetyl chloride $(CH_3COCl)$ in the presence of anhydrous $AlCl_3$ to form acetophenone $(Y)$.$C_6H_6 + CH_3COCl \xrightarrow{Anhydrous \ AlCl_3} C_6H_5COCH_3 + HCl$Thus,$Y$ is acetophenone,which is $C_6H_5COCH_3$.

$Y$ in the above sequence of reaction is

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