In the conversion of A to B,the electrophile | vedclass

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(C) The reaction shown is a Friedel-Crafts acylation of benzene $(A)$ to form acetophenone,which is then further substituted to form $B$. The electrop

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$CH_3CO^{\oplus}$

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(C) The reaction shown is a Friedel-Crafts acylation of benzene $(A)$ to form acetophenone,which is then further substituted to form $B$. The electrophile in the Friedel-Crafts acylation reaction is the acylium ion,$CH_3-C\equiv O^{\oplus}$ (or $CH_3CO^{\oplus}$),which is generated by the reaction of acetyl chloride $(CH_3COCl)$ with the Lewis acid catalyst $AlCl_3$.

In the conversion of $A$ to $B$,the electrophile involved is:

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