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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 question regarding the assertion (A) and reason (R) statements about DMSO and the SN2 reaction, we can break it down step by step: ### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: - The assertion states that "In presence of DMSO solvent, the rate of SN2 reaction increases." - SN2 (Substitution Nucleophilic Bimolecular) reactions are known to be favored in polar aprotic solvents. 2. **Understanding the Reason (R)**: - The reason given is "DMSO is a polar protic solvent." - To evaluate this, we need to clarify the nature of DMSO. 3. **Identifying the Type of Solvent**: - DMSO stands for Dimethyl Sulfoxide. - It has a structure that includes a sulfur atom bonded to a methyl group and a carbonyl group (C=O). - DMSO does not have hydrogen atoms directly bonded to electronegative atoms (like oxygen or nitrogen), which is a characteristic of polar protic solvents. 4. **Determining the Correct Classification**: - Since DMSO does not have such hydrogen atoms, it is classified as a **polar aprotic solvent**. - Polar aprotic solvents do not stabilize nucleophiles through hydrogen bonding, which enhances the rate of SN2 reactions. 5. **Conclusion**: - The assertion (A) is **true** because DMSO does increase the rate of SN2 reactions. - The reason (R) is **false** because DMSO is not a polar protic solvent; it is a polar aprotic solvent. 6. **Final Answer**: - The correct answer is that the assertion is true, but the reason is false. Therefore, the correct option is option 3: "Assertion is true but the reason is false."
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