Consider thiol anion RS and alkoxy anion RO. Which of the following statements is correct?

  1. A

    RS- is less basic and less nucleophilic than RO

  2. B

    RS- is less basic but more nucleophilic than RO

  3. C

    RS- is more basic and more nucleophilic than RO

  4. D

    RS- is more basic but less nucleophilic than RO

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    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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