How Carbonyl Chemistry Connects to Other Topics

Aldehydes/Ketones → Carboxylic Acids (Oxidation):

• Mild oxidation of aldehydes → carboxylic acids (using KMnO4, K2Cr2O7, Tollens', Fehling's)
• Ketones require strong oxidation → C-C bond cleavage (not in NEET scope)
• Connection: Aldehyde = intermediate between alcohol and acid in oxidation state ladder

Aldehydes/Ketones → Alcohols (Reduction):

• NaBH4/LiAlH4 → primary alcohol (from aldehyde), secondary alcohol (from ketone)
• Grignard addition → primary/secondary/tertiary based on HCHO/RCHO/R2CO
• Connection: Reverse of alcohol oxidation (alcohol → aldehyde/ketone with Cr reagents)

Carbonyl Group in Reaction Chains: $\text{Alkene} \xrightarrow{\text{O}_3, \text{Zn/H}_2\text{O}} \text{Aldehyde/Ketone} \xrightarrow{\text{NaBH}_4} \text{Alcohol} \xrightarrow{\text{K}_2\text{Cr}_2\text{O}_7} \text{Aldehyde/Acid}$

Iodoform Test Links Alcohols and Ketones:

• Ethanol → (oxidation in situ) → acetaldehyde → iodoform
• Isopropanol → (oxidation in situ) → acetone → iodoform
• This bridges alcohols chapter with aldehydes/ketones chapter

Amines Connection:

• Aldehydes/ketones react with NH3 derivatives (reductive amination in industry)
• Schiff bases (imines, R2C=NR') from reaction with primary amines — extension of condensation chemistry

Carboxylic Acid Derivatives Connection:

• Cannizzaro produces carboxylate salt (RCOONa) — direct link to RCOO- chemistry
• Haloform reaction produces RCOONa — another route to carboxylic acids