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

1. A

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

2. B

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

3. C

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

4. D

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

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### Solution:

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

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

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