NOMENCLATURE #14 || E Z naming system| CIP Rule || Geometric

Описание: Lecture #14: Nomenclature of Geometric Alkenes (E-Z System) | Cahn-Ingold-Prelog Rules

In this lecture, we have explained all the rules in detail for the E-Z nomenclature of alkenes using the Cahn-Ingold-Prelog (CIP) priority rules. This lecture is specially designed for MS, MSc, BS, MPhil, PhD, MDCAT, and other competitive exams.


---

📌 Rules for E-Z Nomenclature of Alkenes

The E-Z system is used to name geometrical isomers of alkenes based on the Cahn-Ingold-Prelog (CIP) priority rules. The following steps explain how to assign the correct nomenclature:

1️⃣ Assign Priorities to Substituents

Each carbon in the C=C double bond has two groups attached to it.

Assign priorities based on the atomic number of the directly attached atom.

The higher atomic number gets higher priority.

If atoms directly attached are the same, move to the next atom along the chain.


2️⃣ Determine the Position of Higher Priority Groups

If the higher priority groups are on the same side of the double bond → Z (Zusammen)

If the higher priority groups are on the opposite side of the double bond → E (Entgegen)


3️⃣ Special Cases (Break Time, Dot Method, etc.)

Break Time Rule: If there is a tie in atomic numbers, compare the next bonded atoms until a difference is found.

Dot Method: Used when groups have the same atomic number; move along the chain until a difference is identified.



---

📌 Examples of E-Z Nomenclature

Example 1:
CH₃-CH=CH-Cl

Cl has a higher atomic number than CH₃.

If higher priority groups are on the same side, the alkene is Z.

If on opposite sides, it is E.


Example 2:
Br-CH=CH-OH

Br (Atomic number = 35) and OH (Oxygen = 8).

Br has a higher priority than OH.

The naming follows the E-Z rule based on position.



---
Subscribe Now for more lectures & join my FREE online classes for FSC, MDCAT, BS, and MPhil students!
📄 PDF Notes Available – Contact via WhatsApp: 03491931630

This lecture provides full details on Acid Halides, Amides, and Esters, with rules, examples, tips, and solved questions in an easy-to-understand format.

Also visites:
Lecture # 1
IUPAC Nomenclature #1 Basic terms used in nomenclature of Organic compound
🔗    • IUPAC NOMENCLATURE: 1 ||BASIC TERMS USED I...  
Lecture # 2
IUPAC Nomenclature # 2 Rules for Naming ALKANE
🔗    • IUPAC NOMENCLATURE#2||Rules for Naming ALK...  
Lecture #3
IUPAC Nomenclature #3 Rules for Naming Complex substitute compound
|| SPIRO VS BICYCLIC COMPOUND
🖇️    • NOMENCLATURE #3 #Complex substitutent||Cyc...  
Lecture #4
IUPAC Nomenclature #4 Rules for Naming Alkene and Alkyne.
🖇️    • NOMENCLATURE # 4 || IUPAC RULE || Alkene||...  
Lecture #5
IUPAC RULES for Naming ALKYL HALIDE
🖇️   • NOMENCLATURE # 5 || IUPAC RULES #  ALKYL H...  
Lecture #6
IUPAC NOMENCLATURE # NAMING AMINE
🖇️    • NOMENCLATURE #6 || IUPAC RULES AMINE || Ea...  
Lecture # 7
IUPAC NOMENCLATURE #Alcohol , phenol ether and THIOL
🖇️   • Nomenclature #7 IUPAC NAMING Alcohol Pheno...  
Lecture #8
Master Organic nomenclature in One Shots
Lecture #9
NOMENCLATURE of aldehyde and ketones
🖇️    • NOMENCLATURE # 9 || IUPAC NAMING Aldehyde ...  
🖇️   • Nomenclature #8 | Master Organic nomenclat...  
Lecture# 10
Nomenclature of CARBOXYLIC ACID
🖇️   • NOMENCLATURE #10 IUPAC NAMING CARBOXYLIC A...  
Lecturer # 11
NOMENCLATURE of Acide Halide Amide and Ester
🖇️    • NOMENCLATURE #11 | IUPAC NAMING Acide Hali...  
Lecture # 12
NOMENCLATURE of Acide Anhydride Ester and nitrile
🖇️    • NOMENCLATURE #12 | IUPAC NAMING Acide Anhy...  
Lecture # 13
Nomenclature of Heterocyclic compound
🖇️   • NOMENCLATURE #13 | Heterocyclic Compound| ...  
Lecture # 14
E Z nomenclature Cohn Ingold Prelog System Alken geometric isomers
🖇️   • NOMENCLATURE #14 || E Z naming system| CIP...