Question

Consider the following statements with respect to Benzil-Benzylic acid rearrangement and Cannizzaro's reaction: \[\begin{array}{rl} \bullet & \text{(A) Both are base catalyzed reactions.} \\ \bullet & \text{(B) Both reactions involve shifting of an anion in their mechanism.} \\ \bullet & \text{(C) Both reactions can occur inter-molecularly and intra-molecularly.} \\ \bullet & \text{(D) Both involve simultaneous redox reactions.} \\ \end{array}\] Choose the correct answer from the options given below:

• A. (A) and (B) only
• B. (A), (B) and (D) only
• C. (A) and (D) only
• D. (B), (C) and (D) only

Hint:

Base catalysis, shifting of anions, and redox reactions are key features in many organic rearrangements and reactions, including the Benzil-Benzylic acid rearrangement and Cannizzaro's reaction.

Answer 1

The Correct Option is B

Step 1: Base Catalysis.
The Benzil-Benzylic acid rearrangement and Cannizzaro reaction are both base-catalyzed. A base deprotonates the intermediate in the Benzil-Benzylic acid rearrangement. Hydroxide ions facilitate hydride transfer in the Cannizzaro reaction.

Step 2: Anion Shifting.
Anion shifting occurs in the mechanisms of both reactions. In the Benzil-Benzylic acid rearrangement, an anion forms during intermediate creation. The Cannizzaro reaction involves an aldehyde anion in hydride transfer.

Step 3: Inter- and Intra-molecular Reactions.
Both reactions can proceed via inter-molecular and intra-molecular pathways. However, this characteristic is not universally applicable to all instances of both reactions. Therefore, statement (C) is not definitively true for both.

Step 4: Redox Reactions.
Both reactions involve redox changes. The Cannizzaro reaction features one molecule undergoing reduction and another oxidation. The Benzil-Benzylic acid rearrangement also encompasses a redox process.

Step 5: Conclusion.
Consequently, the correct option is (2), encompassing statements (A), (B), and (D) exclusively.

Final Answer: \[\boxed{\text{(2) (A), (B) and (D) only}}\]