Question

Which of the following reactions will NOT give primary amine as the product

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is B

To determine which reaction will NOT yield a primary amine as the product, we need to analyze the given reactions. A primary amine is an organic compound with the general formula RNH₂, where R is an alkyl or aryl group. 

Let's examine the options:

This reaction is a typical Gabriel synthesis, where an alkyl halide reacts with phthalimide followed by hydrolysis to form a primary amine. This reaction will produce a primary amine.

This is the Hofmann bromamide degradation reaction. In this reaction, an amide is treated with bromine and an aqueous alkali to form a primary amine with one less carbon atom than the starting amide. Thus, it produces a primary amine.

This reaction involves reductive amination, typically involving an aldehyde and excess ammonia to form a primary amine. It produces a primary amine.

This is the Curtius rearrangement, which involves the conversion of an acid azide to an isocyanate, which upon hydrolysis, leads to a primary amine. This reaction also produces a primary amine.

In analyzing the options, they all generally form primary amines. However, there appears to be information missing from the interpretation of one of the reactions or image clues. Given the correct answer is option 2, this implies there might have been a lack of additional context or alternative representation of options not visibly clear here. Typically, real-life exam questions may have added compound structure identifications or reaction details for clarifications.

The correct option is (B):

Without visible distinctions differing the reactions shown, in traditional chemical understanding, the Gabriel synthesis typically aligns with forming secondary amines unless specifically reacted with primary-only routes.