Identify the major product formed in the following sequence of reactions:

Question

Assuming 1μg of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the tree after 100 years is ______ × 10^–1μg.
[Given : ln 10 = 2.303; log 2 = 0.30]

Answer 1

To identify the major product formed in the given sequence of reactions, we need to analyze each step:

Bromination: The first step involves the reaction of aniline with bromine in water. This leads to the bromination of the benzene ring. Aniline generally undergoes bromination at the ortho and para positions. However, due to the directing effects of the amino group (-NH₂), we primarily get a trisubstituted product with bromine atoms at the ortho and para positions: 2,4,6-tribromoaniline.
Diazotization: The second step involves reacting the tribromoaniline with NaNO₂/HCl, which leads to the formation of a diazonium salt. The amino group (-NH₂) is converted to a diazonium group (-N₂⁺).
Reductive Deamination: In the final step, the diazonium salt is treated with hypophosphorous acid (H₃PO₂). This results in the reduction of the diazonium group, leading to the removal of the nitrogen group. This step is also known as Sandmeyer's reaction, yielding a debrominated benzene ring structure.

Considering these transformations, the major product formed is bromobenzene. Here is an illustration of the process:

Therefore, the correct option is the one depicting bromobenzene as the final product.

Answer 2

To identify the major product formed in the given sequence of reactions, we need to analyze each step:

Bromination: The first step involves the reaction of aniline with bromine in water. This leads to the bromination of the benzene ring. Aniline generally undergoes bromination at the ortho and para positions. However, due to the directing effects of the amino group (-NH₂), we primarily get a trisubstituted product with bromine atoms at the ortho and para positions: 2,4,6-tribromoaniline.
Diazotization: The second step involves reacting the tribromoaniline with NaNO₂/HCl, which leads to the formation of a diazonium salt. The amino group (-NH₂) is converted to a diazonium group (-N₂⁺).
Reductive Deamination: In the final step, the diazonium salt is treated with hypophosphorous acid (H₃PO₂). This results in the reduction of the diazonium group, leading to the removal of the nitrogen group. This step is also known as Sandmeyer's reaction, yielding a debrominated benzene ring structure.

Considering these transformations, the major product formed is bromobenzene. Here is an illustration of the process:

Therefore, the correct option is the one depicting bromobenzene as the final product.

Identify the major product formed in the following sequence of reactions:

The Correct Option is C

Solution and Explanation

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