The major products A and B from the following reactions are:

(1)

(2)

(3)

(4)

1. Formation of Product A (Bromination)

• Reagents: $$\text{Br}_2\text{ / AcOH}$$ (Bromine in acetic acid)
• Reaction Type: Electrophilic Aromatic Substitution (EAS)
• Mechanism: The $$-\text{NHCOCH}_3$$ (acetamido) group attached to the benzene ring has a lone pair of electrons on the nitrogen atom. This makes it an ortho/para-directing activator.

  However, due to the steric bulk of the acetamido group, substitution at the ortho-position is heavily hindered. Therefore, electrophilic substitution predominantly occurs at the less hindered para-position.

• Product A: 4-bromoacetanilide (or p-bromoacetanilide)

2. Formation of Product B (Reduction)

• Reagent: $$\text{LiAlH}_4$$ (Lithium Aluminum Hydride)
• Reaction Type: Amide Reduction
• Mechanism:

  $$\text{LiAlH}_4$$ is a powerful reducing agent that selectively reduces the carbonyl carbon ($$\text{-C=O}$$) of amides entirely into a methylene group ($$\text{-CH}_2\text{-}$$). Unlike ester or ketone reductions that yield alcohols, amides are converted directly into amines.

  Thus, the $$-\text{NH-CO-CH}_3$$ amide group is reduced to a $$-\text{NH-CH}_2\text{-CH}_3$$ secondary amine group.

• Product B: $$N$$-ethylaniline