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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 : Halogen is deactivating group due to -I effect.
R: Halogen is ortho -para directing due to +M effect .

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-reason question, we will analyze both the assertion (A) and the reason (R) step by step. ### Step 1: Analyze the Assertion (A) **Assertion:** Halogen is a deactivating group due to -I effect. - **Explanation:** The assertion states that halogens are deactivating groups. This is true because halogens (like Cl, Br, I, F) exhibit a -I (negative inductive) effect, which means they withdraw electron density from the aromatic ring. This makes the ring less reactive towards electrophilic substitution reactions. ### Step 2: Analyze the Reason (R) **Reason:** Halogen is ortho-para directing due to +M effect. - **Explanation:** The reason states that halogens direct electrophilic substitution to the ortho and para positions due to a +M (positive mesomeric) effect. This is also true because halogens can donate their lone pairs of electrons to the aromatic ring, increasing electron density at the ortho and para positions, making them more reactive towards electrophiles. ### Step 3: Determine the Relationship Between A and R - Both the assertion and the reason are true. - However, the reason does not correctly explain the assertion. The assertion is based on the -I effect, which indicates that halogens are deactivating groups. The reason discusses the +M effect, which explains the directing influence of halogens but does not clarify why they are considered deactivating. ### Conclusion - The assertion (A) is true. - The reason (R) is true. - The reason is not the correct explanation of the assertion. ### Final Answer The correct option is that both statements are true, but the reason is not the correct explanation of the assertion. ---
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