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Q.

Statement-I: In Hoffman's bromamide degradation reaction, migration of aryl goup (or) alkyl group takes place from carbonyl carbon of amide to nitrogen atom.

Statement-II:The nucleophile in Gabriel's phthalimide synthesis of 1° alkyl amines is N-potassium phthalimide.

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a

Statement -I is correct and statement -II is incorrect

b

Statement -I is incorrect and statement -II is correct

c

Both statements I and II are correct

d

Both statements I and II are incorrect

answer is A.

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Detailed Solution

Reaction I:

R-C(=O)-NH₂ → R-NH₂
 |
 Br₂ + NaOH

Reaction II:

[Cyclic compound with C(=O)-N⁺-R + X⁻] + Nucleophilic reagent (δ⁺ δ⁻) → [Cyclic compound with C(=O)-N-R] + KX

Text at bottom: "Nucleophilic reagent"

Description:

  • Reaction I shows the conversion of an amide (R-C(=O)-NH₂) to a primary amine (R-NH₂) using bromine and sodium hydroxide, which is characteristic of the Hofmann degradation reaction.
  • Reaction II depicts a nucleophilic substitution reaction involving a cyclic compound (appears to be a benzene ring) with a carbonyl-nitrogen side chain, where a nucleophilic reagent attacks and displaces the X⁻ group, forming KX as a byproduct.

The scheme illustrates two different synthetic pathways for amine formation through different mechanistic approaches.

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