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Sanjay 1
option D is the incorrect statement . When optically active 2-iodooctane was allowed to stand in acetone solution containing Na128I (radioactive iodine), the alkyl halide was observed to lose optical activity and to exchange its ordinary iodine for radioactive iodine. The rate of these reactions depended on both [RI] and [128I-], but the loss of optical activity was exactly twice as fast as gain of radioactivity. This unambiguously establishes that in the SN2 mechanism, each molecule undergoing substitution suffers inversion of configuration.