Which of the following reactants is used for the preparation of ethyl benzene, where anhy. AlCl 3 is a catalyst?

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Fridel crafts Alkylation of Benzene takes place when ALkyl halide reacted with Benzene in presence of Anhydrous ${AlCl}_{3}$ .

Now Alkenes can form Alkyl Benzene in Industrial process. The process involves the reaction of Benzene and Ethylene in presence of an Anhydrous ${AlCl}_{3}$ catalyst promoted by $HCl$ .

The $H_{2} C = {CH}_{2} + C_{6} H_{6}$ on reaction produce ethyl benzene as follows

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