JEE MainChemistryAlcohols Phenols and Ethers
Which of the following two-step reaction sequences will yield 2-chloro-4-nitroanisole as the major product starting from anisole?
Options
- A(i) Cl ₂, FeCl ₃ (1 eq) followed by (ii) HNO ₃, H ₂ SO ₄
- B(i) HNO ₃, H ₂ SO ₄ followed by (ii) Cl ₂, FeCl ₃ (1 eq)
- C(i) HNO ₃, H ₂ SO ₄ followed by (ii) Cl ₂ (excess) , FeCl ₃
- D(i) Cl ₂ (excess) , FeCl ₃ followed by (ii) HNO ₃, H ₂ SO ₄
Correct answer
B. (i) HNO ₃, H ₂ SO ₄ followed by (ii) Cl ₂, FeCl ₃ (1 eq)
Step-by-step solution
To synthesize 2-chloro-4-nitroanisole as the major product, we must consider the directing effects of the intermediate formed after the first step. If chlorination is performed first: Anisole reacts with Cl ₂ / FeCl ₃ to give 4-chloroanisole as the major product (due to less steric hindrance at the para position). Subsequent nitration of 4-chloroanisole is controlled by the strongly activating - OCH ₃ group, which directs the incoming NO ₂^+ to its ortho position, yielding 4-chloro-2-nitroanisole. This is not the d