Consider thiol anion $({RS}^{-})$ and alkoxy anion $({RO}^{-})$ . Which of the following statements is correct?

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${RS}^{-}$ is more basic but less nucleophilic than ${RO}^{-}$

${RS}^{-}$ is less basic but more nucleophilic than ${RO}^{-}$

${RS}^{-}$ is less basic and less nucleophilic than ${RO}^{-}$

${RS}^{-}$ is more basic and more nucleophilic than ${RO}^{-}$

answer is B.

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Detailed Solution

RSH is a stronger acid than ROH. Thus, the conjugate base of RSH, i.e. ${RS}^{-},$ is a weaker base than the conjugate base of ROH, i.e. ${RO}^{-}$

In going down a group in the periodic table, nucloephilicity increasses. Thus, ${RS}^{-}$ is more nucleophilic than ${RO}^{-}$ .

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