Predict the major products when isopropylbenzene is irradiated by light and treated with excess br2.

The reaction of isopropylbenzene with bromine under light is a radical reaction. The light initially reactions with the bromine in the initiation step to form the bromine radicals:

Br₂ + hv → 2Br·

The next step is the first propagation step where a bromine radical reacts with the isopropylbenzene to abstract the hydrogen from the tertiary carbon in the isopropyl group:

                CH₃                          CH₃
                 |                               |
Br· + Ph--C--H  → H-Br + Ph--C·
                 |                               |
                CH₃                          CH₃

We have now formed a radical in the benzylic position of the isopropylbenzene structure. Now this radical will react with another molecule of bromine in a second propogation step to form the final brominated product:

       CH₃                        CH₃
        |                             |
Ph--C·   + Br-Br → Ph--C--Br  + Br·
        |                             |
       CH₃                        CH₃

The bromine radical can terminate in a reaction with another bromine radical or the benzylic radical to give more of the final product. The final product is shown and is called (2-bromopropan-2-yl)benzene.

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Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.