Consider the following sequence of reactions.
`C_(6)H_(6) + CH_(3) CH = CH_(2) underset("heat")overset(H_(3)PO_(4))rarrA underset(2. H_(3)O^(+))overset(1. O_(2), "heat")rarr B + C`
The products (B) and (C) are:

Options

A. benzaldehyde and acetaldehyde
B. benzoic acid and acetic acid
C. phenol and propionadehyde
D. phenol and acetone

Explanation

To solve the given sequence of reactions, we will break it down step by step.

### Step 1: Identify the Reactants
The reactants in the first step are benzene (C₆H₆) and propene (CH₃CH=CH₂).

### Step 2: Understand the Reaction Conditions
The reaction is heated in the presence of H₃PO₄ (phosphoric acid). This indicates that we are likely undergoing an electrophilic addition reaction.

### Step 3: Reaction of Benzene with Propene
When benzene reacts with propene in the presence of H₃PO₄ and heat, we can expect an alkylation reaction to occur. The propene will add to the benzene ring, forming a new compound. The product formed here is known as cumene (isopropylbenzene).

**Product A: Cumene (C₆H₅C(CH₃)₂)**

### Step 4: Second Reaction with Cumene
In the next step, cumene (A) is treated with O₂ (oxygen), heat, and then H₃O⁺ (acidic conditions). This is indicative of a cumene hydroperoxide rearrangement.

### Step 5: Mechanism of Cumene Hydroperoxide Rearrangement
The cumene hydroperoxide rearrangement involves the formation of free radicals and leads to the production of phenol and acetone.

**Products B and C:**
- Product B: Phenol (C₆H₅OH)
- Product C: Acetone (CH₃COCH₃)

### Final Products
Thus, the products (B) and (C) of the reaction sequence are:
- B: Phenol (C₆H₅OH)
- C: Acetone (CH₃COCH₃)

### Summary of the Reaction Sequence
1. Benzene + Propene (in presence of H₃PO₄ and heat) → Cumene (A)
2. Cumene + O₂ (in presence of heat and H₃O⁺) → Phenol (B) + Acetone (C)