Frequency & Weightage
- Amines & Diazonium Salts: 2–3 questions/year in NEET; consistently high-yield
- Part of NCERT Class 12 Chapter 13 (Amines); direct NCERT questions are common
Most Frequently Tested Areas (Ranked)
- Aqueous basicity order — Appears almost every year; classic trap (3° loses to 2° in water)
- Gabriel phthalimide limitations — "Which cannot be prepared by Gabriel synthesis?" — aniline, 2°, 3° are all wrong answers
- Diazonium salt product prediction — Given reagent, identify product (Sandmeyer, Schiemann, coupling)
- Carbylamine test identification — Which amine gives isocyanide?
- Hoffmann bromamide — carbon count — Product has fewer carbons than amide
Question Types
| Type | Example |
|---|---|
| Direct recall | "Which method gives only 1° aliphatic amines?" |
| Mechanism reasoning | "Why is aqueous basicity of (){3}N less than (){2}NH?" |
| Product identification | " + followed by heat gives?" |
| Statement-based (true/false) | "Gabriel synthesis can prepare aniline — T/F?" |
| Order/comparison | "Arrange following amines in increasing order of basicity" |
High-Yield NEET Traps
- Gas phase vs aqueous basicity — Most students memorise gas-phase order and get the aqueous question wrong
- Gattermann vs Sandmeyer — Sandmeyer needs CuX salt; Gattermann needs Cu° powder; confusing them is a classic error
- Coupling medium — Phenol = alkaline; aniline = weakly acidic; swapping these is a trap
- Schiemann = only route to ArF — No other reaction gives aryl fluoride reliably; this is unique
Years Amines Appeared (Representative)
NEET 2019, 2020, 2021, 2022, 2023, 2024 — all had at least one amine/diazonium question; basicity order appeared in 2019, 2021, 2023.