In the given reaction sequence, the major product 'C' is :
`C_8H_(10)underset(H_2SO_4)overset(HNO_3)rarrAunderset(Delta)overset(Br_2)rarrBunderset(KOH)overset("alcoholic")rarrC`

Options

A.
B.
C.
D.

Answer

To solve the problem, we will analyze the reaction sequence step by step to determine the major product 'C'.

### Step 1: Identify the starting compound
The starting compound is given as C₈H₁₀. This suggests that the compound has a benzene ring due to the presence of 6 carbon atoms in the ring and additional carbon atoms attached to it. A possible structure for C₈H₁₀ could be ethylbenzene (C₆H₅-CH₂-CH₃).

### Step 2: Reaction with H₂SO₄ and HNO₃
The first step involves treating the compound with concentrated sulfuric acid (H₂SO₄) and nitric acid (HNO₃). This is a nitration reaction, which typically introduces a nitro group (-NO₂) onto the benzene ring. The major product of this reaction will be para-nitroethylbenzene due to the stability of the para position compared to the ortho position.

**Structure of Product A:**
- The structure will be:
- C₆H₄(NO₂)(C₂H₅) (para-nitroethylbenzene)

### Step 3: Reaction with Br₂
Next, the product A (para-nitroethylbenzene) is treated with bromine (Br₂) under heat. This reaction will lead to the bromination of the ethyl group due to the activating effects of the nitro group on the benzene ring. The bromine will add to the ethyl side chain.

**Structure of Product B:**
- The structure will be:
- C₆H₄(NO₂)(C₂H₄Br) (bromoethylbenzene)

### Step 4: Reaction with alcoholic KOH
Finally, the product B is treated with alcoholic KOH. This is a dehydrohalogenation reaction, where the bromine atom and a hydrogen atom from the adjacent carbon will be eliminated to form an alkene. The major product will be the elimination of HBr, leading to the formation of an alkene.

**Structure of Product C:**
- The structure will be:
- C₆H₄(NO₂)(C₂H₄) (para-nitro-ethylbenzene with an alkene)

### Conclusion
The major product 'C' after the entire reaction sequence is para-nitroethylbenzene with an alkene structure.

### Final Answer
The major product 'C' is para-nitro-ethylbenzene.

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