ChemistryChapter 20: Nitrogen Compounds-Amines
Basicity — Strength Order
Typical school: aliphatic amine > NH3 > phenylamine.
Learning objectives
- Define strength order using accurate chemistry terms.
- Explain why strength order matters within basicity.
- Apply the learning unit to an FBISE-style example, comparison, diagram, or calculation.
Definition
Typical school: aliphatic amine > NH3 > phenylamine. Explain with availability of the pair. pKb / pKa of conjugate if tables given. Salt formation with HCl gives ammonium chloride — water soluble. This page separates the idea from the wider topic “BASICITY” so it can be revised and assessed on its own.
Important terms
- STRENGTH ORDER
- Typical school: aliphatic amine > NH3 > phenylamine.
- BASICITY
- Amines accept H+ (Bronsted) using the lone pair.
Overview
Study this learning unit in three steps:
Key Idea
Typical school: aliphatic amine > NH3 > phenylamine. Explain with availability of the pair. pKb / pKa of conjugate if tables given. Salt formation with HCl gives ammonium chloride — water soluble.
Examples Alkyl donors named · Ring withdraws named · Not a dose
Exam Application
Exam basicity: amines are weak bases (lone pair) aliphatic usually > ammonia phenylamine weaker (pair into the ring) if asked
Examples Alkyl donors named · Ring withdraws named · Not a dose
WHAT — BASICITY — STRENGTH ORDER
Typical school: aliphatic amine > NH3 > phenylamine. Explain with availability of the pair. pKb / pKa of conjugate if tables given. Salt formation with HCl gives ammonium chloride — water soluble. This page separates the idea from the wider topic “BASICITY” so it can be revised and assessed on its own.
WHY — Why this topic matters
BASICITY — STRENGTH ORDER 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
Typical school: aliphatic amine > NH3 > phenylamine. Explain with availability of the pair. pKb / pKa of conjugate if tables given. Salt formation with HCl gives ammonium chloride — water soluble. Examples: Alkyl donors named; Ring withdraws named; Not a dose. Exam use: Exam basicity: amines are weak bases (lone pair) aliphatic usually > ammonia phenylamine weaker (pair into the ring) if asked
Explanation
Typical school: aliphatic amine > NH3 > phenylamine. Explain with availability of the pair. pKb / pKa of conjugate if tables given. Salt formation with HCl gives ammonium chloride — water soluble. Examples: Alkyl donors named; Ring withdraws named; Not a dose. Exam use: Exam basicity: amines are weak bases (lone pair) aliphatic usually > ammonia phenylamine weaker (pair into the ring) if asked
In simple words
Federal Board Class 11 Chemistry learning unit. Easy wording; no provincial-board material added.
Key points
- pair more available
- pair availability
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Basicity — Strength Order
Sticky Notes · Quick Revision
Core idea
- Typical school: aliphatic amine > NH3 > phenylamine. Explain with availability of the pair. pKb / pKa of conjugate if tables given. Salt formation with HCl gives ammonium chloride — water soluble. This page separates the idea from the wider topic “BASICITY” so it can be revised and assessed on its own.
WHAT
- Typical school: aliphatic amine > NH3 > phenylamine.
WHY
- BASICITY — STRENGTH ORDER is an independent FBISE learning unit because students must use its definitions, conditions, equations, or trends separately in explanations and calculations.
HOW
- Typical school: aliphatic amine > NH3 > phenylamine. Explain with availability of the pair. pKb / pKa of conjugate if tables given. Salt formation with HCl gives ammonium chloride — water soluble. Examples: Alkyl donors named; Ring withdraws named; Not a dose. Exam use: Exam basicity: amines are weak bases (lone pair) aliphatic usually > ammonia phenylamine weaker (pair into the ring) if asked
Common misconception
- Do not treat strength order as the same as every other part of basicity; define this unit and use its own evidence, steps, or conditions.
FBISE exam check
- Define basicity — strength order, explain how it works, and support the answer with one relevant example.
60-second revision
- Typical school: aliphatic amine > NH3 > phenylamine.
- Alkyl donors named
- Exam link: pair more available.
Did you understand this topic?
Your answer is saved with your learning record. It does not mark the topic as mastered.