Question

Consider the following reaction:

Hint:

In oxidation reactions with KMnO₄, the alkyl side chains of aromatic compounds are typically converted to carboxylic acids.

Answer 1

Correct Answer: 1

To determine compound 'A', consider each reaction step:

• Hydrogenation (H₂/Pt): Aromatic rings remain unchanged; however, any reducible alkene is converted to an alkane. Observing the product, the aromatic ring stays intact, and the non-aromatic bridge remains saturated, suggesting a biphenyl structure like 1,2-dihydronaphthalene as a possibility.
• Oxidation (hot alk. KMnO₄): This step oxidizes alkanes at the benzylic position to carboxylic acids. The reaction confirms the presence of two benzylic Carboxylic acids, indicating a structure with two benzylic positions.

Reviewing options:

Naphthalene

Tetrahydronaphthalene

1,2-Dihydronaphthalene

3,4-Dihydronaphthalene

The correct identification based on the reactivity and transformations is option 3: 1,2-Dihydronaphthalene.

Validation within the expected range 1,1 results in a precise answer: 1 (Option 3 is consistent with this index).