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Assertion : SN(2) reaction of an optical...

Assertion : `SN_(2)` reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with opposite sign of rotation.
Reason : `S_(N)` reactions always proceed with inversion of configuration.

A

Assertion is correct, reason is correct, reason is a correct explanation for assertion.

B

Assertion is correct, reason is correct, reason is not a correct explanation for assertion

C

Assertion is correct, reason is incorrect

D

Assertion is incorrect, reason is correct.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason statements provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that the `SN2` reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with the opposite sign of rotation. - An `SN2` reaction involves a nucleophile attacking a substrate and displacing a leaving group in a single step, leading to inversion of configuration. 2. **Analyzing Aryl Halides**: - Aryl halides (halides attached to an aromatic ring) do not typically undergo `SN2` reactions under normal conditions. This is due to the resonance stabilization of the halogen bond with the aromatic ring, which makes the carbon-halogen bond stronger and less reactive. - Therefore, the assertion that an `SN2` reaction occurs with aryl halides is incorrect. 3. **Understanding the Reason**: - The reason states that `SN2` reactions always proceed with inversion of configuration. - This statement is true. In an `SN2` mechanism, the nucleophile attacks the substrate from the side opposite to the leaving group, resulting in an inversion of configuration. 4. **Conclusion**: - Since the assertion is false (because aryl halides do not undergo `SN2` reactions) and the reason is true (because `SN2` reactions do involve inversion of configuration), the correct conclusion is that the assertion is incorrect while the reason is correct. ### Final Answer: - Assertion is incorrect, and Reason is correct.
To solve the question, we need to analyze both the assertion and the reason statements provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that the `SN2` reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with the opposite sign of rotation. - An `SN2` reaction involves a nucleophile attacking a substrate and displacing a leaving group in a single step, leading to inversion of configuration. ...
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