Question

Correct statements for the given reaction are:

A. Compound 'B' is aromatic 
B. The completion of above reaction is very slow 
C. 'A' shows tautomerism 
D. The bond lengths C-C in compound B are found to be same 
Choose the correct answer from the options given below:

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

Answer 1

The Correct Option is C

To solve this problem, we need to analyze the given reaction and statements related to compounds 'A' and 'B'.

Step 1: Understanding Compound 'A'

Compound 'A' as seen in the image is a cyclic diketone with hydroxyl groups, which may form tautomers by transferring a hydrogen atom within the molecule. This property signifies that compound 'A' shows tautomerism.

Step 2: Reaction Analysis

The reaction involves the treatment of compound 'A' with two equivalents of OH^- to form compound 'B'. This reaction suggests that 'B' undergoes some structural transformation.

Step 3: Aromaticity and Bond Lengths in Compound 'B'

Compound 'B', formed in this reaction, is likely a stabilized structure, potentially aromatic due to resonance in the new ring formed after deprotonation and reorganization.

Aromaticity generally implies equal bond lengths due to delocalized electrons across the ring structure. Therefore, the statement that the C-C bond lengths in compound 'B' are the same is correct.

Evaluation of Provided Statements:

• A. Compound 'B' is aromatic: True, because the reaction suggests the formation of a delocalized electron system.
• B. The completion of the above reaction is very slow: Usually not true for such reactions; therefore, this statement is likely incorrect.
• C. 'A' shows tautomerism: True, as discussed, due to keto-enol tautomerism.
• D. The bond lengths C-C in compound B are found to be the same: True, consistent with aromatic structures.

Conclusion:

The correct statements are A, C, and D only. Thus, the correct choice is:

A, C and D only