Read the assertion and reason carefully to mark the correct option out...
Halogens are somewhat deactivating but o, p-directing. As a result, aryl halides undergo the usual electrophilic substitution reactions less readily than benzene.
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Read the assertion and reason carefully to mark the correct option out...
Understanding the Assertion and Reason
The assertion states that aryl halides undergo electrophilic substitutions more readily than benzene. The reason given is that aryl halides yield a mixture of ortho- and para-products.
Analysis of the Assertion
- Aryl Halides and Electrophilic Substitution:
- Aryl halides are aromatic compounds where at least one hydrogen is replaced by a halogen (like Cl, Br, or I).
- The presence of the halogen introduces electron-withdrawing effects, which typically makes electrophilic substitution reactions less favorable.
- In contrast, benzene, which has no substituents, has a full electron cloud that stabilizes electrophilic attack.
Analysis of the Reason
- Product Distribution:
- Aryl halides do yield a mixture of ortho- and para-substituted products, which is true.
- However, this characteristic does not inherently enhance the reactivity of aryl halides in electrophilic substitution compared to benzene.
Conclusion
- Truth Value of Assertion and Reason:
- The assertion is false because aryl halides do not undergo electrophilic substitution more readily than benzene; in fact, they are generally less reactive.
- The reason is also false in the context of providing an explanation for the assertion, as the product mixture does not indicate increased reactivity.
Correct Answer
- Since both the assertion and reason are false, the correct option is E: If the assertion is false but the reason is true.