The structure of major products A,B and C in the following reaction are sequence.

Based on the reaction steps shown in the image:

Major products:

• A: The intermediate formed when the aldehyde is treated sequentially with NaHSO₃/dil. HCl and NaCN/H₂O is a cyanohydrin.
  Structure:
  3,3-dimethylpentanenitrile (CH₃–C(CH₃)₂–CH₂–CH(CN)–OH)
• B: When the cyanohydrin (A) is reduced with LiAlH₄, the nitrile group is reduced to primary amine.
  Structure:
  3,3-dimethylpentylamine (CH₃–C(CH₃)₂–CH₂–CH(CH₂NH₂)–OH) OR after rearrangement, the primary amine corresponding to reduction at the cyano-carbon.
• C: On acid hydrolysis (HCl/H₂O, Δ), the nitrile group in (A) is hydrolyzed to a carboxylic acid.
  Structure:
  3,3-dimethylpentanoic acid (CH₃–C(CH₃)₂–CH₂–CH(COOH)–OH)

Sequence:

• A: Cyanohydrin derivative (hydroxynitrile)
• B: Primary amine (from reduction with LiAlH₄)
• C: Carboxylic acid (from hydrolysis of nitrile)

The structures progress from nitrile (A) → amine (B) OR carboxylic acid (C) depending on the reaction used after cyanohydrin formation.