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.
Both the Benzil-Benzylic acid rearrangement and Cannizzaro's reaction are base-catalyzed reactions. In the Benzil-Benzylic acid rearrangement, the base is required to deprotonate the intermediate. Similarly, in Cannizzaro's reaction, hydroxide ions facilitate the transfer of hydride.

Step 2: Anion Shifting.
Both reactions involve the shifting of an anion in their mechanisms. In the Benzil-Benzylic acid rearrangement, an anion is formed during the formation of the intermediate, and in the Cannizzaro reaction, an anion of the aldehyde is involved in the hydride transfer.

Step 3: Inter and Intra-molecular Reactions.
Both reactions can occur inter-molecularly and intra-molecularly. However, this is not specifically true for both reactions and doesn't apply to all cases. Thus, (C) is not necessarily true for both reactions.

Step 4: Redox Reactions.
Both reactions involve redox changes. In the Cannizzaro reaction, one molecule undergoes reduction while another undergoes oxidation. The Benzil-Benzylic acid rearrangement also involves a redox process.

Step 5: Conclusion.
Thus, the correct answer is (2) (A), (B) and (D) only.

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