Which of the following reaction sequences sho | vedclass

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(C) To achieve an overall inversion of configuration,the sequence must involve an odd number of $S_N2$ reactions.Option $A$: $R-Cl \xrightarrow{NaI/Ac

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(C) To achieve an overall inversion of configuration,the sequence must involve an odd number of $S_N2$ reactions.Option $A$: $R-Cl \xrightarrow{NaI/Acetone} R-I$ (Inversion) $\xrightarrow{CH_3ONa/DMF} R-OCH_3$ (Inversion). Two inversions result in retention of configuration.Option $B$: $R-OH \xrightarrow{SOCl_2/Pyridine} R-Cl$ (Inversion) $\xrightarrow{CH_3ONa/DMF} R-OCH_3$ (Inversion). Two inversions result in retention of configuration.Option $C$: $R-OH \xrightarrow{SOCl_2} R-Cl$ (Retention via $S_Ni$ mechanism) $\xrightarrow{CH_3ONa/DMF} R-OCH_3$ (Inversion). One inversion results in overall inversion of configuration.Option $D$: $R-OH$ $\xrightarrow{Na} R-ONa$ $\xrightarrow{CH_3-I} R-OCH_3$. This is the Williamson ether synthesis,which proceeds with retention of configuration at the chiral center.

Which of the following reaction sequences shows an overall inversion of configuration in the product?

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What is the primary product of an $S_N1$ reaction on an optically active substance?

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