Carbonyl Compounds

Step 1: Reaction involves a conjugated diene and a dienophile.
Step 2: Formation of a six-membered ring occurs via cycloaddition.

Step 1: Condition for Claisen condensation. The ester must contain at least one α-hydrogen.
Step 2: Analysis of option (2). Ethyl benzoate has no α-hydrogen adjacent to the carbonyl group.
Step 3: Conclusion. Hence, it cannot undergo Claisen self-condensation.

Step 1: Iodoform test. Acetophenone gives positive iodoform test.
Step 2: Benzophenone behaviour. Benzophenone does not respond to iodoform test.

Step 1: Wacker process.
The Wacker process is used for the industrial preparation of acetone by the oxidation of alkenes.
Thus, the correct answer is (2).

Step 1: Claisen condensation.
The preparation of ethyl acetoacetate involves a Claisen condensation reaction, where two molecules of an ester react in the presence of a base to form a β-keto ester.
Thus, the correct answer is (4).

Step 1: Correct reaction mechanisms.
- The Clemmensen reduction involves the reduction of a carbonyl group to a methylene group .
- The Wolf-Kishner reduction reduces a carbonyl group to a methylene group (not ).
Thus, option (2) is incorrectly matched.
Thus, the correct answer is (2).

Step 1: Analyze the reactivity of carbonyl compounds.
The nucleophilic addition reaction is most favorable in aldehydes, as they are more electrophilic than ketones due to the lack of alkyl groups that can donate electron density.
Step 2: Conclusion.
The aldehyde is the most reactive towards nucleophilic addition. Final Answer:

Step 1: Understand the reaction sequence.
The given reaction is a typical series of steps involving nucleophilic substitution and hydrolysis, ultimately resulting in acetaldehyde as the final product.
Step 2: Conclusion.
The correct product is . Final Answer:

Step 1: Given compound undergoes base-catalyzed rearrangement.
Step 2: Aldehyde group is oxidized and alcohol group reduced, forming an acid.
Step 3: Resulting isomer is phenylacetic acid.