Assertion : $R S^{⊝}$ is a stronger nucleophile and a better leaving group than $R O^{⊝}$
Reason : $R S^{⊝}$ is a weaker base than $R O^{⊝}$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Acidity: $R S H > R O H$
Basicity: $R S^{⊝} < R O^{⊝}$
When nucleophilic centres are different and belong to the same group, nucleophilicity is antiparallel to basicity.
Nucleophilicity: $R S^{⊝} < R O^{⊝}$
Weaker the base. better is the leaving group
So the leaving group ability of $R S^{⊝} < R O^{⊝}$

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Assertion : RS⊝ is a stronger nucleophile and a better leaving group than RO⊝Reason : RS⊝ is a weaker base than RO⊝

Assertion : $R S^{⊝}$ is a stronger nucleophile and a better leaving group than $R O^{⊝}$
Reason : $R S^{⊝}$ is a weaker base than $R O^{⊝}$