What product is formed when benzene is treated with the following organic halide in the presence of alcl3?

Explanation:

This is an example of a Friedel-Crafts alkylation.

Since no organic halide is provided, we'll use an example of how benzene reacts with chloroethane, for instance.

Benzene is not reactive, therefore, we require a catalyst for such a reaction, typically either aluminum chloride or iron(III) chloride. It provides a pathway to add an alkyl chain to the benzene ring by removing the halogen present in the R-Cl molecule.

The mechanism is summarized by:

a catalyst (aluminum chloride or iron(III) chloride is required);benzene is a reagent;alkyl chloride is another reagent;chlorine is removed from the alkyl chain and the latter substitutes one hydrogen of the benzene ring.

This is a so-called electrophilic substitution mechanism. To illustrate it with my example, I'm providing an image below.

Yes it would be a physical change.

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