In part 1 of the question if only allylic substitution is possible then how come there are 2 monochlorinated products?

Dear Student,

The given ethylbenzene forms primary and secondary chloride products with varying proportions under the presence of light during chlorine reaction, the reason two monocholoro products is formed by the free radical substitution reaction which is influenced by light.

C6H5-CH2-CH3 Cl2/hvC6H5CH2CH2-Cl  (28%) + C6H5CHCH3                                                                                                                         Cl (72%)
Hence m = 2


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