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The Cahn - Ingold - Prelog Notation

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Total cards: 8•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (8)

#1
Front (Question)

What type of isomerism does E-Z notation describe?

Back (Answer)

E-Z stereoisomerism

#2
Front (Question)

What does E stand for in E-Z notation?

Back (Answer)

E = the highest priority groups on each carbon of the double bond are on opposite sides

#3
Front (Question)

What does Z stand for in E-Z notation

Back (Answer)

Z = the highest priority groups on each carbon of the double bond are on the same side

#4
Front (Question)

What was the older name for E-Z isomerism?

Back (Answer)

Cis - trans isomerism

#5
Front (Question)

What is the link between E/Z and cis/trans notation?

Back (Answer)

Z corresponds to cis E corresponds to trans

#6
Front (Question)

What is E-Z notation based on?

Back (Answer)

The atomic numbers of the atoms attached to each carbon in the C=C double bond

#7
Front (Question)

How do you decide which atom has priority in E-Z isomerism?

Back (Answer)

The atom with the higher atomic number has the highest priority

#8
Front (Question)

What is the simplest way to determine if a molecule has E/Z isomerism?

Back (Answer)

If the highest atomic number atoms are on the same side, the isomer is Z. If they are on opposite sides, it is E