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In the following questions, a statement ...

In the following questions, a statement of assertion (A) is following by a statement of reason (R )
A : In presence of DMSO Solvent, the rate of `S_(N)`2 reaction inceases.
R : DMSO is a polar protic solvent .

A

If both Assertion & Reason are the reason is the correct explanation of the assertion, then mark (1).

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark(2).

C

If Assertion is true statement but Reason is false , then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion and reason question, we need to analyze both statements carefully. ### Step 1: Analyze the Assertion (A) The assertion states: "In presence of DMSO solvent, the rate of \( S_N2 \) reaction increases." - **Explanation**: DMSO (dimethyl sulfoxide) is known to be a polar aprotic solvent. In \( S_N2 \) reactions, the rate is influenced by the solvent used. Polar aprotic solvents like DMSO stabilize the transition state without stabilizing the nucleophile too much. This leads to an increase in the rate of \( S_N2 \) reactions because they allow the nucleophile to be more reactive. ### Step 2: Analyze the Reason (R) The reason states: "DMSO is a polar protic solvent." - **Explanation**: This statement is incorrect. DMSO is actually a polar aprotic solvent, not a polar protic solvent. Protic solvents can form hydrogen bonds due to the presence of hydrogen atoms bonded to electronegative atoms (like O or N), while aprotic solvents cannot. Since DMSO does not have hydrogen atoms bonded to electronegative atoms that can participate in hydrogen bonding, it is classified as polar aprotic. ### Step 3: Conclusion - The assertion (A) is true because DMSO does increase the rate of \( S_N2 \) reactions. - The reason (R) is false because DMSO is a polar aprotic solvent, not a polar protic solvent. ### Final Answer - Assertion (A) is true. - Reason (R) is false.
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