1.

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

Answer»

`RS^(-)` is less BASIC but more nucleophilic than `RO^(-)`
`RS^(-)` is more basic and more nucleophilic than `RO^(-)`
`RS^(-)` is more basic and less nucleophilic than `RO^(-)`
`RS^(-)` is less basic and less nucleophilic than `RO^(-)`

Solution :On moving down a group, the basicity an nucleophilic are inversely RELATED, i.e., NUCLEOPHILICITY increase while basicity decrease, i.e., `RS^(-)` is more nucleophilic but less basic than `RO^(-)`.This OPPOSITE behaviour is because of the fact that basicity and nucleophilic depends upon DIFFERENT is indirectly related to the strength of the H-element-bond. while nucleophilicity in indirectly related to the electronegativity of the atom to which proton is attached.


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