Question

The final product (C) in the given reaction sequence is

• A. Benzophenone
• B. Diphenyl methane
• C. Diphenylmethanol
• D. Benzoic acid

Hint:

Wolff-Kishner reduction (N$_2$H$_4$/KOH, heat) reduces ketones to alkanes. Always verify reaction conditions, as solvent typos (e.g., methanol vs. ethylene glycol) can occur.

Answer 1

The Correct Option is B

To solve the problem, we need to identify the final product (C) in the given sequence of reactions. The reaction involves a carboxylic acid undergoing a series of steps to produce a specific organic compound.

1. Understanding the Concepts:

- Reaction 1 (Formation of A): The carboxylic acid (C₆H₅COOH) reacts with thionyl chloride (SOCl₂) to form an acyl chloride (C₆H₅COCl). This reaction converts the -COOH group into an acyl chloride group (-COCl), which is a common intermediate for further reactions.

- Reaction 2 (Formation of B): The acyl chloride (C₆H₅COCl) reacts with aluminum chloride (AlCl₃), a Lewis acid, which facilitates the formation of a ketone structure by promoting the reaction with benzene to form benzophenone (C₆H₅COC₆H₅).

- Reaction 3 (Formation of C): The ketone (benzophenone) reacts with hydrazine (NH₂-NH₂) and potassium hydroxide (KOH) in the presence of heat, leading to the formation of diphenylmethane. This is a typical reaction where the ketone is reduced to the corresponding alkyl compound by hydrazine.

2. Given Values:

The given reactions involve:

• Step 1: Conversion of carboxylic acid to acyl chloride.
• Step 2: Formation of benzophenone.
• Step 3: Reduction of benzophenone to diphenylmethane.

3. Analyzing the Options:

1. Benzophenone: Benzophenone is an intermediate product (formed in Step 2), but it is not the final product.

2. Diphenyl methane: Diphenyl methane is the final product formed after the reduction of benzophenone in Step 3, making this the correct answer.

3. Diphenylmethanol: This is not the expected product from the given reaction sequence.

4. Benzoic acid: Benzoic acid is the starting material and is not the product in the given reaction sequence.

Final Answer:

The final product (C) in the given reaction sequence is Diphenyl methane (Option 2).