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Preparation Names (school)
From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitrobenzene + Sn/HCl named if aromatic amines in the book. These are exam route names. They are not procedures to make controlled amines or dyes for harm, and not multi-step illicit synthesis. From halogenoalkane + NH3; reduction of nitrile or
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Preparation Names (school)
What is it?
From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitrobenzene + Sn/HCl named if aromatic amines in the book. These are exam route names. They are not procedures to make controlled amines or dyes for harm, and not multi-step illicit synthesis. From halogenoalkane + NH3; reduction of nitrile or nitro compound — named routes. Nitrous acid behaviour differs for 1, 2, and 3 amines — classify before predicting the product.
In simple words
- From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem).
- 1. ALIPHATIC: CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named).
- 2. AROMATIC NAMED: Nitrobenzene reduction named (Sn/conc HCl school).
- Exam reminder: Exam route: bromoethane + excess NH3 -> ethanamine or nitrile reduced (named reductant) names only, not a manufacture SOP
Important terms
PREPARATION NAMES (SCHOOL): From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem).
1. ALIPHATIC: CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named).
2. AROMATIC NAMED: Nitrobenzene reduction named (Sn/conc HCl school).
What you should learn
- Explain preparation names (school) in simple chemical language.
- Connect 1. aliphatic with 2. aromatic named using equations, observations, or trends where needed.
- Answer a short Federal Board question with the correct terms and a clear reason.
Examples
- Excess NH3
- Nitrile reduce named
- Not a plant
ALIPHATIC
CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named). Excess ammonia favours 1 amine. Further substitution makes 2 and 3 (named nuisance). Gabriel synthesis named for primary amine — textbook label.
AROMATIC NAMED
Nitrobenzene reduction named (Sn/conc HCl school). Phenylamine product. Azo dyes named as a later idea if the book links — names, not a dye-factory or banned-dye recipe. Not a lab manual — exam wants equation sketch only.
Recommended for Class 11
Full school-level explanation
From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitrobenzene + Sn/HCl named if aromatic amines in the book. These are exam route names. They are not procedures to make controlled amines or dyes for harm, and not multi-step illicit synthesis. From halogenoalkane + NH3; reduction of nitrile or nitro compound — named routes. Nitrous acid behaviour differs for 1, 2, and 3 amines — classify before predicting the product.
Two aliphatic routes, then aromatic name:
WHAT — PREPARATION NAMES (SCHOOL)
From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitrobenzene + Sn/HCl named if aromatic amines in the book. These are exam route names. They are not procedures to make controlled amines or dyes for harm, and not multi-step illicit synthesis. From halogenoalkane + NH3; reduction of nitrile or nitro compound — named routes. Nitrous acid behaviour differs for 1, 2, and 3 amines — classify before predicting the product.
WHY — Why this topic matters
PREPARATION NAMES (SCHOOL) is an independent FBISE learning unit because students must use its definitions, conditions, equations, or trends separately in explanations and calculations.
HOW — How it works
ALIPHATIC: CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named). Excess ammonia favours 1 amine. Further substitution makes 2 and 3 (named nuisance). Gabriel synthesis named for primary amine — textbook label. Examples: Excess NH3; Nitrile reduce named; Not a plant. AROMATIC NAMED: Nitrobenzene reduction named (Sn/conc HCl school). Phenylamine product. Azo dyes named as a later idea if the book links — names, not a dye-factory or banned-dye recipe. Not a lab manual — exam wants equation sketch only. Examples: Sn/HCl named; Phenylamine; No drug route. Exam route: bromoethane + excess NH3 -> ethanamine or nitrile reduced (named reductant) names only, not a manufacture SOP
ALIPHATIC
CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named). Excess ammonia favours 1 amine. Further substitution makes 2 and 3 (named nuisance). Gabriel synthesis named for primary amine — textbook label.
Remember
- substitution
Examples
- Excess NH3
- Nitrile reduce named
- Not a plant
AROMATIC NAMED
Nitrobenzene reduction named (Sn/conc HCl school). Phenylamine product. Azo dyes named as a later idea if the book links — names, not a dye-factory or banned-dye recipe. Not a lab manual — exam wants equation sketch only.
Remember
- nitro -> amino named
Examples
- Sn/HCl named
- Phenylamine
- No drug route
Remember
- haloalkane + NH3 named
- nitrile reduction named
- excess NH3
- names only
- substitution
- nitro -> amino named
- haloalkane + NH3 named
- nitrile reduction named
How the ideas connect
Exam route: bromoethane + excess NH3 -> ethanamine or nitrile reduced (named reductant) names only, not a manufacture SOP
Deeper understanding
Go beyond memorising Preparation Names (school). Connect the definition to reasons, relationships, exceptions, and exam wording.
How the ideas connect
Exam route: bromoethane + excess NH3 -> ethanamine or nitrile reduced (named reductant) names only, not a manufacture SOP
Common mistakes
Exam focus
Core Idea
1. ALIPHATIC
2. AROMATIC NAMED
Exam Example
Exam focus
Quick revision
- haloalkane + NH3 named
- nitrile reduction named
- excess NH3
- names only
- PREPARATION NAMES (SCHOOL): From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem).
- 1. ALIPHATIC: CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named).
Route names. No controlled-substance synthesis.
For long answers on Preparation Names (school): define clearly → explain the main parts → give one example → state one exam caution.
Exam Focus
Exam Focus
Important points
- haloalkane + NH3 named
- nitrile reduction named
- excess NH3
- names only
Important formulas
- haloalkane + NH3 named
- nitrile reduction named
- excess NH3
Common exam traps
- Do not confuse 1. ALIPHATIC with 2. AROMATIC NAMED; state the difference before giving an example.
- Writing only “haloalkane + NH3 named” is not enough. Explain what it means in a complete sentence.
Long question structure
Definition → key parts → example → exam caution
Common Mistakes
Common Mistakes
- Mistake
Do not confuse 1. ALIPHATIC with 2. AROMATIC NAMED; state the difference before giving an example.
- Mistake
Writing only “haloalkane + NH3 named” is not enough. Explain what it means in a complete sentence.
- Mistake
Route names. No controlled-substance synthesis.
- Mistake
Route names. No controlled-substance synthesis.
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
haloalkane + NH3 named
nitrile reduction named
excess NH3
names only
From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitro
- Definition
- From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitro
- Example
- Excess NH3
- Critical warning
- Do not confuse 1. ALIPHATIC with 2. AROMATIC NAMED; state the difference before giving an example.
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Exam Practice
Define
Q1. Define Preparation Names (school).
Explain
Q2. Explain: ALIPHATIC.
Example
Q3. Give one clear example of Preparation Names (school) and say why it fits.
Mistake
Q4. State one common mistake students make about Preparation Names (school).
Exam note
Q5. Write a short exam note on Preparation Names (school): definition, two points, one example.
Sources & References
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.