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A : Nitration of benzoic acid gives orth...

A : Nitration of benzoic acid gives ortho and para derivatives of nitrobenzoic acids.
R : Carboxyl group is activating group.

A

If both Assertion & Reason are true and 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 analyze the given assertion and reason, we will break down the statements step by step. ### Step 1: Understanding the Assertion The assertion states that "Nitration of benzoic acid gives ortho and para derivatives of nitrobenzoic acids." - **Explanation**: Nitration is a process where a nitro group (NO2) is introduced into a benzene ring. In general, the position where the nitro group attaches depends on the substituents already present on the ring. ### Step 2: Analyzing the Nitration of Benzoic Acid Benzoic acid (C6H5COOH) has a carboxyl group (-COOH) attached to the benzene ring. - **Key Point**: The carboxyl group is an electron-withdrawing group due to its -I (inductive) effect and -M (mesomeric) effect. ### Step 3: Directing Effects of the Carboxyl Group The carboxyl group is known to be a meta-directing group in electrophilic aromatic substitution reactions, such as nitration. - **Conclusion**: When nitration occurs, the nitro group will preferentially attach to the meta position relative to the carboxyl group, not the ortho or para positions. ### Step 4: Evaluating the Reason The reason states that "Carboxyl group is an activating group." - **Explanation**: This statement is incorrect. The carboxyl group is not an activating group; it is a deactivating group because it withdraws electron density from the aromatic ring, making it less reactive towards electrophiles. ### Final Conclusion - **Assertion**: False (Nitration of benzoic acid does not yield ortho and para derivatives; it yields meta derivatives). - **Reason**: False (The carboxyl group is a deactivating group, not an activating group). ### Final Answer Both the assertion and the reason are false.
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Knowledge Check

  • Assertion : Nitration of benzoic acid gives meta nitrobenzoic acid. Reason : Carboxyl group deactivates the ortho and para positions in the ring.

    A
    If both assertion and reason are correct and reason is correct explanation for assertion.
    B
    If both assertion and reason are correct but reason is not correct explanation for assertion.
    C
    If assertion is correct but reason is incorrect.
    D
    If assertion and reason are both incorrect.

  • Assertion (A) : Benzoic acid does not undergo Friedal-Crafts reaction. Reason (R ) : The carboxyl group is activating and undergo electrophilic substitution reaction.

    A
    Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
    B
    Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
    C
    Assertion (A) is correct, but Reason (R) is incorrect statement.
    D
    Assertion (A) is incorrect, but Reason (R) is correct statement.

  • Assertion (A): Benzoic acid does not undergo Friedel-craft's reaction. Reaction (R): The carboxyl group is activating and undergo electrophilic substitution reaction.

    A
    Both A and Rare true and R is the correct explanation of A
    B
    Both A and R are true but R is NOT the correct explanation of A
    C
    A is true but R is false
    D
    A is false and R is true