Question

Match the reaction in Column I with the major product formed given in Column II.

• A. A = Q, B = P, C = S, D = R
• B. A = S, B = R, C = Q, D = P
• C. A = Q, B = S, C = P, D = R
• D. A = R, B = P, C = S, D = Q

Hint:

In organic reactions, knowing the reagents and conditions helps to predict the type of reaction (e.g., Friedel-Crafts alkylation, Grignard reaction) and the products formed.

Answer 1

The Correct Option is D

Step 1: Analyzing reaction A.
In reaction A, Benzene (C6H6) reacts with oleum, NaOH, and H+. This suggests a Friedel-Crafts alkylation mechanism where a methyl group is added to benzene. The main product formed here is Propan-2-ol (P), a secondary alcohol. This corresponds to Q in Column II.

Step 2: Analyzing reaction B.
Butanal reacts with MeMgBr in dry ether, followed by treatment with H+. This is a typical Grignard reaction, resulting in the formation of a 2-Hydroxybenzoic acid (Q). This corresponds to P in Column II.

Step 3: Analyzing reaction C.
2-Methylpropene undergoes a hydroboration-oxidation reaction with B2H6 and H2O2/NaOH, yielding Phenol (R) as the main product. This corresponds to R in Column II.

Step 4: Analyzing reaction D.
Phenol reacts with NaOH and CO2 under conditions of 400 K and 7 atm pressure, a typical mechanism for the formation of 2-Methylpropan-1-ol (S). This corresponds to S in Column II.

Step 5: Conclusion.
After analyzing each reaction and matching the products, the correct order is given in Option D: \( \text{A} = \text{R}, \text{B} = \text{P}, \text{C} = \text{S}, \text{D} = \text{Q} \).