NEET Frequency Analysis (OC-07: Carboxylic Acids)
| Topic | Estimated Frequency (per 5 years) | Question Type | NEET Difficulty |
|---|---|---|---|
| Acidity order (substituent effects) | 3–4 questions | MCQ ranking | Easy–Medium |
| NaBH4 vs LiAlH4 reduction | 2–3 questions | MCQ (identify product) | Easy (trap) |
| HVZ reaction (conditions + limitations) | 2–3 questions | MCQ | Medium |
| Fischer esterification | 1–2 questions | MCQ | Easy–Medium |
| Soda lime decarboxylation (product) | 1–2 questions | MCQ | Easy |
| Kolbe electrolysis (product + electrode) | 1–2 questions | MCQ | Medium |
| Grignard synthesis of RCOOH | 1–2 questions | MCQ (identify Grignard) | Medium |
| SOCl2 vs PCl5 (byproducts) | 1 question | MCQ | Easy–Medium |
| pKa acidity ladder (functional group types) | 1–2 questions | MCQ ranking | Easy |
| Preparation methods (identify method) | 1 question | MCQ | Easy |
Most Frequently Tested Concepts
- Acidity order with halogen substitution — appears in almost every NEET paper in some form.
- NaBH4 does NOT reduce RCOOH — the single most-tested trap in the chapter.
- HVZ: requires alpha-H; HCOOH and ArCOOH cannot undergo — tested every 2 years.
- Fischer = reversible; Saponification = irreversible — appears in comparison questions.
- Soda lime gives (n–1)-carbon alkane — tested as product identification.
PYQ Pattern Observations
- Questions often present 4 acids and ask for acidity ranking — always use pKa values from memory.
- Trap questions frequently give NaBH4 + carboxylic acid and list ethanol as option (a) — always choose "no reaction."
- HVZ questions often list formic acid and benzoic acid as options — select the one that CANNOT react.
- Kolbe electrolysis questions test which electrode (anode) and what organic product (symmetric alkane).